DEAN WITTER JAPAN FUND
497, 1996-07-29
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<PAGE>
                        DEAN WITTER
                        JAPAN FUND
                        PROSPECTUS--JULY 24, 1996
 
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DEAN  WITTER JAPAN FUND (THE "FUND")  IS AN OPEN-END, NON-DIVERSIFIED MANAGEMENT
INVESTMENT COMPANY  WHOSE  INVESTMENT OBJECTIVE  IS  TO SEEK  LONG-TERM  CAPITAL
APPRECIATION.  THE  FUND SEEKS  TO MEET  ITS  INVESTMENT OBJECTIVE  BY INVESTING
PRIMARILY IN SECURITIES OF ISSUERS LOCATED IN JAPAN. (SEE "INVESTMENT  OBJECTIVE
AND POLICIES.")
 
Shares  of the  Fund are  continuously offered  at net  asset value  without the
imposition of  a  sales  charge. However,  redemptions  and/or  repurchases  are
subject in most cases to a contingent deferred sales charge, scaled down from 5%
to 1% of the amount redeemed, if made within six years of purchase, which charge
will  be  paid to  the Fund's  Distributor, Dean  Witter Distributors  Inc. (See
"Redemptions and Repurchases--Contingent Deferred  Sales Charge.") In  addition,
the  Fund pays the Distributor a Rule  12b-1 distribution fee pursuant to a Plan
of Distribution at  the annual rate  of 1.0% of  the lesser of  the (i)  average
daily  aggregate net sales  or (ii) average  daily net assets  of the Fund. (See
"Purchase of Fund Shares--Plan of Distribution.")
 
This Prospectus  sets forth  concisely the  information you  should know  before
investing  in the  Fund. It  should be read  and retained  for future reference.
Additional  information  about  the  Fund  is  contained  in  the  Statement  of
Additional  Information,  dated July  24, 1996,  which has  been filed  with the
Securities and Exchange  Commission, and which  is available at  no charge  upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
 
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
Summary of Fund Expenses..........................       3
Financial Highlights..............................       4
The Fund and its Management.......................       5
Investment Objective and Policies.................       5
  Risk Factors and Special Considerations.........       6
Investment Restrictions...........................      12
Purchase of Fund Shares...........................      13
Shareholder Services..............................      14
Redemptions and Repurchases.......................      16
Dividends, Distributions and Taxes................      18
Performance Information...........................      18
Additional Information............................      19
Report of Independent Accountants.................      20
Financial Statements--May 31, 1996................      21
</TABLE>
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY,  ANY BANK, AND THE  SHARES ARE NOT FEDERALLY  INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
DEAN WITTER
JAPAN FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
(212) 392-2550 or
(800) 869-NEWS (toll free)
 
- --------------------------------------------------------------------------------
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
                   DEAN WITTER DISTRIBUTORS INC., DISTRIBUTOR
<PAGE>
PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------
 
<TABLE>
<S>             <C>
THE             The  Fund is organized as a Trust, commonly known as a Massachusetts business trust, and
FUND            is  an  open-end,  non-diversified  management  investment  company.  The  Fund  invests
                primarily in securities of issuers located in Japan.
- -------------------------------------------------------------------------------------------------------
SHARES OFFERED  Shares of beneficial interest with $0.01 par value (see page 19).
- -------------------------------------------------------------------------------------------------------
MINIMUM         Minimum   initial  investment,   $1,000  ($100   if  the   account  is   opened  through
PURCHASE        EasyInvest-SM-); minimum subsequent investment, $100 (see page 13).
- -------------------------------------------------------------------------------------------------------
OFFERING        At net asset value without sales charge (see page 13). Shares redeemed within six  years
PRICE           of  purchase are subject to a contingent  deferred sales charge under most circumstances
                (see page 17).
- -------------------------------------------------------------------------------------------------------
INVESTMENT      The investment objective of the Fund is to seek long-term capital appreciation (see page
OBJECTIVE       5).
- -------------------------------------------------------------------------------------------------------
INVESTMENT      Dean Witter InterCapital Inc., the Investment Manager of the Fund, and its  wholly-owned
MANAGER AND     subsidiary,  Dean Witter Services Company Inc.,  serve in various investment management,
SUB-ADVISER     advisory, management and administrative capacities to ninety-eight investment  companies
                and  other portfolios with net assets under management of approximately $84.6 billion at
                June 30,  1996.  Morgan Grenfell  Investment  Services Ltd.  has  been retained  by  the
                Investment  Manager as  Sub-Adviser to provide  investment advice and  manage the Fund's
                portfolio. Morgan  Grenfell  Investment Services  Ltd.  currently serves  as  investment
                adviser  for  primarily U.S.  corporate and  public  employee benefit  plans, investment
                companies, endowments and foundations with assets of approximately $14.1 billion at June
                30, 1996 (see page 5).
- -------------------------------------------------------------------------------------------------------
MANAGEMENT      The Investment Manager receives a monthly fee at  the annual rate of 1.0% of the  Fund's
FEE             daily net assets, of which the Sub-Adviser receives 40% (see page 5).
- -------------------------------------------------------------------------------------------------------
DIVIDENDS AND   Dividends from net investment income, if any, are paid at least annually. Capital gains,
DISTRIBUTIONS   if  any, are  distributed at least  annually or  retained for reinvestment  by the Fund.
                Dividends and capital  gains distributions  are automatically  reinvested in  additional
                shares  at net  asset value  (without sales  charge), unless  the shareholder  elects to
                receive cash (see page 18).
- -------------------------------------------------------------------------------------------------------
DISTRIBUTOR     Dean Witter Distributors  Inc. (the  "Distributor"). The Distributor  receives from  the
                Fund  a distribution fee accrued daily and payable monthly at the rate of 1.0% per annum
                of the lesser of  (i) the Fund's average  daily aggregate net sales  or (ii) the  Fund's
                average daily net assets. This fee compensates the Distributor for the services provided
                in  distributing shares of the Fund and for sales related expenses. The Distributor also
                receives the proceeds of any contingent deferred sales charges (see pages 13 and 17).
- -------------------------------------------------------------------------------------------------------
REDEMPTION--    Shares are  redeemable  by  the shareholder  at  net  asset value.  An  account  may  be
CONTINGENT      involuntarily  redeemed if the total value  of the account is less  than $100 or, if the
DEFERRED SALES  account was opened through  EasyInvest-SM-, if after twelve  months the shareholder  has
CHARGE          invested  less  than $1,000  in the  account. Although  no commission  or sales  load is
                imposed upon the  purchase of shares,  a contingent deferred  sales charge (scaled  down
                from  5% to  1%) is imposed  on any  redemption of shares  if after  such redemption the
                aggregate current value of an account with the Fund is less than the aggregate amount of
                the investor's purchase  payments made during  the six years  preceding the  redemption.
                However,  there  is  no  charge  imposed  on  redemption  of  shares  purchased  through
                reinvestment of dividends or distributions (see pages 16-18).
- -------------------------------------------------------------------------------------------------------
RISKS           The net asset value of the Fund's shares will fluctuate with changes in market value  of
                portfolio  securities. The concentration  of the Fund's assets  in Japanese issuers will
                subject the Fund  to the risks  of adverse  social, political or  economic events  which
                occur  in  or affect  Japan. It  should be  recognized that  the foreign  securities and
                markets in  which  the  Fund  invests  pose  different  and  greater  risks  than  those
                customarily  associated with  domestic securities and  their markets. The  Fund may also
                invest in options and futures transactions which may be considered speculative in nature
                and may  involve  greater risks  than  those  customarily assumed  by  other  investment
                companies  which do  not invest  in such  instruments (see  pages 6-12).  The Fund  is a
                non-diversified investment company and, as such,  is not subject to the  diversification
                requirements  of the  Investment Company  Act of  1940. As  a result,  a relatively high
                percentage of the Fund's assets may be invested in a limited number of issuers. However,
                the Fund intends to qualify as a  regulated investment company under the federal  income
                tax  laws  and, as  such, will  be subject  to the  diversification requirements  of the
                Internal Revenue Code (see pages 10 and 18).
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                          ELSEWHERE IN THIS PROSPECTUS
                AND IN THE STATEMENT OF ADDITIONAL INFORMATION.
 
2
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------
 
The  following table illustrates all expenses and fees that a shareholder of the
Fund will incur. The estimated fees and expenses set forth in the table are  for
the fiscal year ending May 31, 1997.
 
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
<S>                                                                     <C>
Maximum Sales Charge Imposed on Purchases.............................  None
Maximum Sales Charge Imposed on Reinvested Dividends..................  None
Contingent Deferred Sales Charge
  (as a percentage of the lesser of original purchase price or
   redemption proceeds)...............................................  5.0%
</TABLE>
 
 A contingent deferred sales charge is imposed at the following declining rates:
 
<TABLE>
<CAPTION>
YEAR SINCE PURCHASE PAYMENT MADE                                        PERCENTAGE
- ----------------------------------------------------------------------  --------
<S>                                                                     <C>
First.................................................................        5.0%
Second................................................................        4.0%
Third.................................................................        3.0%
Fourth................................................................        2.0%
Fifth.................................................................        2.0%
Sixth.................................................................        1.0%
Seventh and thereafter................................................    None
</TABLE>
 
<TABLE>
<S>                                                                     <C>
Redemption Fees.......................................................      None
Exchange Fee..........................................................      None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees.......................................................      1.0%
12b-1 Fees*...........................................................      1.0%
Other Expenses........................................................     0.41%
Total Fund Operating Expenses**.......................................     2.41%
- ------------------------
 *  The 12b-1 fee is  accrued daily and payable  monthly, at an annual
   rate of 1.0%  of the  lesser of:  (a) the  average daily  aggregate
   gross  sales of the  Fund's shares since the  inception of the Fund
   (not including reinvestments of  dividends or distributions),  less
   the  average daily aggregate  net asset value  of the Fund's shares
   redeemed  since  the  Fund's  inception  upon  which  a  contingent
   deferred sales charge has been imposed or waived, or (b) the Fund's
   average daily net assets. A portion of the 12b-1 fee equal to 0.25%
   of  the  Fund's  average daily  net  assets is  characterized  as a
   service  fee  within  the   meaning  of  National  Association   of
   Securities  Dealers, Inc. ("NASD") guidelines and is a payment made
   to the selling  broker for personal  service and/or maintenance  of
   shareholder  accounts. The remainder  of the 12b-1  fee is an asset
   based  sales  charge,  and  is  a  distribution  fee  paid  to  the
   Distributor  to  compensate it  for the  services provided  and the
   expenses borne by the Distributor and others in the distribution of
   the Fund's shares (see "Purchase of Fund Shares").
** "Total Fund Operating Expenses," as shown above, is based upon  the
   sum  of 12b-1 Fees, Management  Fees and estimated "Other Expenses"
   which may be incurred  by the Fund for  the fiscal year ending  May
   31, 1997.
</TABLE>
 
<TABLE>
<CAPTION>
EXAMPLE                                                        1 YEAR    3 YEARS
- ------------------------------------------------------------  --------   --------
<S>                                                           <C>        <C>
You would pay the following expenses on a $1,000 investment,
 assuming (1) 5% annual return and (2) redemption at the end
 of each time period:.......................................  $    74    $   105
You would pay the following expenses on the same investment,
 assuming no redemption:....................................  $    24    $    75
</TABLE>
 
THE  ABOVE EXAMPLE SHOULD NOT  BE CONSIDERED A REPRESENTATION  OF PAST OR FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE GREATER OR LESS THAN
THOSE SHOWN.
 
The purpose of this table is to assist the investor in understanding the various
costs and  expenses  that  an  investor  in  the  Fund  will  bear  directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
"The Fund  and its  Management,"  "Plan of  Distribution" and  "Redemptions  and
Repurchases."
 
Long-term   shareholders  of  the  Fund  may  pay  more  in  sales  charges  and
distribution fees than the  economic equivalent of  the maximum front-end  sales
charges permitted by the NASD.
 
                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
The  following per  share data  and ratios  for a  share of  beneficial interest
outstanding for the period April  26, 1996 (commencement of operations)  through
May 31, 1996 have been audited by Price Waterhouse LLP, independent accountants.
The  financial  highlights  should be  read  in conjunction  with  the financial
statements,  notes  thereto  and  the  unqualified  report  of  the  independent
accountants contained in this Prospectus commencing at page 20.
 
<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                        APRIL 26, 1996*
                                                                            THROUGH
                                                                          MAY 31, 1996
                                                                        ----------------
<S>                                                                     <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................       $10.00
                                                                             ------
  Net investment loss.................................................      --
  Net realized and unrealized loss....................................        (0.39)
                                                                             ------
  Net asset value, end of period......................................       $ 9.61
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................        (3.90)%(1)
RATIOS TO AVERAGE NET ASSETS:
  Expenses............................................................         2.84%(2)
  Net investment loss.................................................        (0.52)%(2)
SUPPLEMENTAL DATA:
  Net assets, end of period, in thousands.............................     $273,544
  Portfolio turnover rate.............................................           --%(1)
  Average commission rate paid........................................     $ 0.0424
</TABLE>
 
- ------------------------
*  COMMENCEMENT OF OPERATIONS.
+  DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE.
(1) NOT ANNUALIZED.
(2) ANNUALIZED.
 
4
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
Dean  Witter Japan Fund (the "Fund") is an open-end, non-diversified, management
investment company.  The  Fund is  a  trust of  the  type commonly  known  as  a
"Massachusetts  business  trust"  and  was  organized  under  the  laws  of  The
Commonwealth of Massachusetts on January 22, 1996.
 
    Dean Witter InterCapital Inc. ("InterCapital" or the "Investment  Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment  Manager.  The Investment  Manager, which  was incorporated  in July,
1992, is a wholly-owned  subsidiary of Dean Witter,  Discover & Co. ("DWDC"),  a
balanced  financial services organization providing  a broad range of nationally
marketed credit and investment products.
 
    InterCapital and its wholly-owned  subsidiary, Dean Witter Services  Company
Inc.,   serve  in  various  investment   management,  advisory,  management  and
administrative capacities to ninety-eight investment companies, thirty of  which
are listed on the New York Stock Exchange, with combined assets of approximately
$81.8  billion at June 30, 1996.  The Investment Manager also manages portfolios
of  pension  plans,   other  institutions  and   individuals  which   aggregated
approximately $2.8 billion at such date.
 
    The  Fund  has retained  the  Investment Manager  to  provide administrative
services, manage its business affairs and supervise the investment of the Fund's
assets. InterCapital has retained Dean  Witter Services Company Inc. to  perform
the aforementioned administrative services for the Fund.
 
    Under  a Sub-Advisory Agreement between  Morgan Grenfell Investment Services
Limited (the "Sub-Adviser") and the Investment Manager, the Sub-Adviser provides
the Fund with investment advice and portfolio management relating to the  Fund's
investments,  subject to the overall supervision  of the Investment Manager. The
Fund's Trustees review the various  services provided by the Investment  Manager
and  the Sub-Adviser to  ensure that the Fund's  general investment policies and
programs are being  properly carried  out and that  administrative services  are
being provided to the Fund in a satisfactory manner.
 
    The  Sub-Adviser,  whose address  is  20 Finsbury  Circus,  London, England,
manages, as  of  June  30,  1996, assets  of  approximately  $14.1  billion  for
primarily   U.S.  corporate  and  public   employee  benefit  plans,  investment
companies, endowments and foundations. The Sub-Adviser is an indirect subsidiary
of Deutsche Bank AG, the largest commercial bank in Germany.
 
    As full compensation for the services  and facilities furnished to the  Fund
and  for expenses of the  Fund assumed by the  Investment Manager, the Fund pays
the Investment Manager  monthly compensation  calculated daily  by applying  the
annual  rate of 1.0% to the Fund's  net assets. As compensation for its services
provided pursuant to the Sub-Advisory Agreement, the Investment Manager pays the
Sub-Adviser monthly compensation equal to 40% of its monthly compensation.
 
    The Fund's expenses  include: the  fee of  the Investment  Manager; the  fee
pursuant  to the  Plan of Distribution  (see "Purchase of  Fund Shares"); taxes;
certain legal, transfer  agent, custodian  and auditing fees;  and printing  and
other expenses relating to the Fund's operations which are not expressly assumed
by  the Investment  Manager under its  Investment Management  Agreement with the
Fund.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment objective of the Fund is to seek long-term capital  appreciation.
The objective is a fundamental policy of the Fund and may not be changed without
shareholder approval. There is no assurance that the objective will be achieved.
 
    The  Fund  seeks to  achieve its  investment  objective by  investing, under
normal circumstances, at  least 65%  of its  total assets  in equity  securities
issued  by issuers  located in  Japan. Such  issuers will  include companies (i)
which are organized  under the  laws of  Japan and  have a  principal office  in
Japan;  (ii) which  derive 50%  or more of  their total  revenues from operating
business(es) in  Japan; or  (iii)  the equity  securities  of which  are  traded
principally  on a stock exchange  in Japan. Equity securities  in which the Fund
may invest  include  common and  preferred  stocks  and rights  or  warrants  to
purchase common stocks.
 
    The  Fund may invest up  to 25% of its total  assets in equity securities of
Japanese companies traded on the Second Sections of the Main Japanese  exchanges
and  in the over-the-counter market. These  would generally be smaller companies
with  above-average   growth  potential.   (See   "Risk  Factors   and   Special
Considerations.")
 
    As  a "single country" mutual fund, the Fund may exhibit certain speculative
characteristics and thus  should not constitute  a complete investment  program.
Investing internationally involves certain risks, such as economic and political
risk,  and therefore  poses different and  greater risks  than those customarily
associated with domestic securities and their markets. The concentration of  the
Fund's  assets in Japanese issuers will subject the Fund to the risks of adverse
social, political or economic events which occur in Japan (see "Risk Factors and
Special Considerations").
 
    The remainder of the Fund's portfolio equalling, at times, up to 35% of  the
Fund's  total assets, may be invested in fixed-income and convertible securities
of issuers
 
                                                                               5
<PAGE>
located in Japan or guaranteed by the Japanese government when it is deemed that
such investments  are  consistent with  the  Fund's investment  objective.  This
remainder  may  also include  equity,  government, fixed-income  and convertible
securities issued by issuers located in developed economies in Asia, Europe  and
North  America, including  the United States,  subject to  the Fund's investment
objective. Although  the  Fund  may invest  up  to  35% of  its  net  assets  in
fixed-income  and convertible  securities which  are either  not rated  or rated
below investment grade, the Fund has no current intention of investing in excess
of 10% of its net assets in unrated or lower rated convertible securities nor in
excess of 5% of its  net assets in unrated  or lower rated non-convertible  debt
securities (see "Lower Rated Convertible and Fixed-Income Securities" below). In
addition,  this portion  of the Fund's  portfolio will consist  of various other
financial instruments  such  as  forward  foreign  exchange  contracts,  futures
contracts and options.
 
    The Fund may also invest in securities of Japanese and other foreign issuers
in the form of American Depository Receipts (ADRs), European Depository Receipts
(EDRs)  or  other  similar  securities convertible  into  securities  of foreign
issuers. These  securities  may  not  necessarily be  denominated  in  the  same
currency  as the securities into which they  may be converted. ADRs are receipts
typically issued by a United States  bank or trust company evidencing  ownership
of  the underlying securities.  EDRs are European  receipts evidencing a similar
arrangement. Generally, ADRs, in  registered form, are designed  for use in  the
United  States securities markets and EDRs, in bearer form, are designed for use
in European securities markets.
 
    The Sub-Adviser will use a "bottom-up" approach, whereby the  identification
of  earnings  growth and  attractively  priced stocks  drives  the Sub-Adviser's
investment process.  However,  no investments  will  be made  without  assessing
future  country  risk (including  politics, monetary  policy and  currency) that
might adversely affect  stock selection.  The Sub-Adviser  believes that  strong
growth  will be reflected in superior investment returns. A company's ability to
grow earnings leads to the  accumulation of assets, increased dividend  payments
and, ultimately, drives share prices higher.
 
    Because  market inefficiency can lead to  "over" as well as "under" pricing,
the Sub-Adviser believes that an assessment of company growth prospects must  be
combined with an understanding of how the stock is priced. A series of multiples
is  used for this purpose and evaluated against the stock's history. Stocks that
are trading  significantly  above  their historic  norm  are  disqualified  from
inclusion  in the portfolio.  In addition, the Fund  will maintain a disciplined
sell process for liquidating portfolio holdings.
 
    There may be periods during which, in the opinion of the Investment  Manager
or Sub-Adviser, market conditions warrant reduction of some or all of the Fund's
securities  holdings.  During  such  periods, the  Fund  may  adopt  a temporary
"defensive" posture in which greater than  35% and, in some circumstances up  to
100%,  of its net assets are invested in cash or money market instruments. Money
market instruments  in  which the  Fund  may  invest are  securities  issued  or
guaranteed  by the U.S.  Government (Treasury bills,  notes and bonds, including
zero coupon securities); bank obligations  (such as certificates of deposit  and
bankers'  acceptances); Yankee instruments;  Eurodollar certificates of deposit;
obligations of savings institutions; fully insured certificates of deposit;  and
commercial  paper rated within the  two highest grades by  Moody's or S&P or, if
not rated, issued by a company having  an outstanding debt issue rated at  least
AA by S&P or Aa by Moody's.
 
    To  hedge  against adverse  price movements  in the  securities held  in its
portfolio and the currencies in  which they are denominated  (as well as in  the
securities  it might wish to purchase and their denominated currencies) the Fund
may engage in  transactions in  forward foreign currency  contracts, options  on
securities  and  currencies,  and  futures  contracts  and  options  on  futures
contracts on  securities, currencies  and indexes.  The Fund  may also  purchase
options   on  securities  to  facilitate  its  participation  in  the  potential
appreciation of the value  of the underlying securities.  A discussion of  these
transactions  follows below under "Risk  Factors and Special Considerations" and
is  supplemented  by   further  disclosure  in   the  Statement  of   Additional
Information.
 
RISK FACTORS AND SPECIAL
CONSIDERATIONS
 
Investing  in  Japanese equity  securities  involves certain  risks  and special
considerations as follows:
 
THE JAPANESE SECURITIES MARKETS
 
    (a) The  Exchange  Market.    The  Japanese  exchange  market  is  a  highly
systemized,  government  regulated market  currently  consisting of  eight stock
exchanges. The  three Main  Japanese  Exchanges (Tokyo,  Osaka and  Nagoya)  are
comprised  of First and Second Sections.  The First Sections have more stringent
listing standards with  respect to  a company's  number of  years in  existence,
number  of outstanding shares and trading  volume and, accordingly, list larger,
more established companies than the Second Sections. The Fund intends to  invest
primarily  in the  securities of  companies listed on  the First  Section of the
Tokyo Stock  Exchange  ("TSE"). The  TSE  is the  largest  exchange and,  as  of
December  29,  1995,  listed  1,253  companies  with  market  capitalization  of
approximately  U.S.$3.3  trillion   and  average  monthly   trading  volume   of
approximately U.S.$62.4 billion. The Fund may invest up to 25% of its net assets
in  securities which  are traded  on the  Second Sections  of the  Main Japanese
Exchanges (primarily, the  TSE) and  in the  over-the-counter market,  described
below. These are generally smaller, less capitalized companies than those traded
on  the First Sections. As  of December 29, 1995, the  Second Section of the TSE
listed approximately 461 companies  with market capitalization of  approximately
 
6
<PAGE>
U.S.$147.3  billion and average monthly trading volume of approximately U.S.$3.9
billion. There  are also  five regional  exchanges in  which the  Fund does  not
currently intend to invest.
 
    (b)  The OTC Market.   The Japanese  OTC market is  less systemized than the
stock exchanges. Trading  of equity  securities in  the Japanese  OTC market  is
conducted  by securities firms in Japan, primarily through an organization which
acts as a "matching agent" by matching  buy and sell orders. As of December  29,
1995,  677  companies  with market  capitalization  of  approximately U.S.$142.1
billion and average  monthly trading  volume of  approximately U.S.$4.7  billion
were traded through the Japanese OTC market.
MARKET  RISKS.  Although  the market for  Japanese equities traded  on the First
Section of the TSE is substantial in terms of trading volume and liquidity,  the
TSE  has nonetheless exhibited significant market volatility in the past several
years. With respect  to the  OTC market,  trades of  certain stocks  may not  be
effected  on days when the matching of buy  and sell orders for such stocks does
not occur. The  liquidity of the  Japanese OTC market,  as well as  that of  the
Second  Sections  of  the exchanges,  although  increasing in  recent  years, is
limited by the small  number of publicly  held shares which  trade on a  regular
basis.  Overall, Japanese  securities markets have  declined significantly since
1989 which has contributed to a weakness in the Japanese economy and the  impact
of  a further decline cannot be ascertained.  The common stocks of many Japanese
companies continue, as they have  historically, to trade at high  price-earnings
ratios  in  comparison with  those in  the  U.S., even  after the  recent market
decline. Differences  in accounting  methods make  it difficult  to compare  the
earnings  of  Japanese companies  with those  of  companies in  other countries,
especially the United States.
 
POLITICAL RISKS.   Japan has a  parliamentary form of  government. Triggered  by
successive  revelations  of  political  scandals,  one-party  domination  by the
Liberal Democratic  Party  which was  established  in 1955,  was  terminated  in
mid-1993.  Since then, political instability has resulted from frequent turnover
of coalition governments and prime ministers.  What, if any, effect the  current
political  situation will have on prospective  regulatory reforms of the economy
in Japan  cannot be  predicted.  Recent and  future  developments in  Japan  and
neighboring  Asian countries may lead to  changes in policy that might adversely
affect the Fund.
 
JAPANESE GOVERNMENT  REGULATION.    A  foreign  investor  may  not  directly  or
indirectly  acquire 10% or  more of the  total outstanding shares  of a Japanese
corporation without prior notification  to the Ministry  of Finance ("MOF")  and
any  other  ministry  with  proper  jurisdiction.  Such  ministries  may  make a
recommendation to modify or prohibit  the proposed acquisition if they  consider
that  such acquisition falls  under certain limited  conditions specified in the
Foreign  Exchange  Controls.  If  the  foreign  investor  does  not  accept  the
recommendation,  such ministries may issue an order modifying or prohibiting the
acquisition. The Fund will be considered a foreign investor for this purpose.
 
ECONOMIC FACTORS.  The  Japanese economy experienced  its worst recession  since
World  War II in  the 1990s. While  Japan's Economic Planning  Agency claims the
recession ended in  October 1993, the  economy has been  largely stagnant  since
then.  In  addition, asset  deflation, both  financial and  in real  estate, has
exerted a continuous drag on the economy. The Japanese government has called for
a transformation of  the economy  away from  its high  dependency on  export-led
growth  towards greater stimulation of the  domestic economy. The plan calls for
direct government spending on public works and includes measures to support weak
land prices and to revitalize Japan's stagnating financial markets. There is  no
assurance that this package, however, will succeed in fueling economic growth.
 
    Strains  in the financial system  have also been one  of the major causes of
Japan's economic weakness.  The non-performing loans  of financial  institutions
have hampered their ability to take on risks, thus obstructing the flow of funds
into  capital outlays as well as equities. At the end of 1995, Japan's financial
institutions were estimated by the government  to have at least yen 40  trillion
(U.S.$400 billion) in outstanding loans, including uncollectible loans estimated
at  yen  10-15 trillion.  While the  banking  system appears  to be  making some
progress in its attempt to deal with non-performing assets, the overall problems
in the banking system could make economic recovery more difficult to achieve and
may lead to a crisis in the banking system itself.
 
INTERNATIONAL TRADE.  Japan is largely dependent upon foreign economies for  raw
materials.  International  trade is  important  to Japan's  economy,  as exports
provide the means to pay for many  of the raw materials it must import.  Because
of  the concentration  of Japanese  exports in  highly visible  products such as
automobiles, machine tools  and semiconductors,  and the  large trade  surpluses
ensuing therefrom, Japan has entered a difficult phase in its relations with its
trading  partners, particularly with respect to the United States, with whom the
trade imbalance is  the greatest.  It is  possible that  differences over  trade
policy may lead the U.S. to take actions which may have an adverse effect on the
Japanese economy.
 
CURRENCY  FACTORS.  Securities in Japan are denominated and quoted in "yen." Yen
are fully convertible and transferable based on floating exchange rates into all
currencies, without administrative or legal restrictions for both  non-residents
and  residents of  Japan. In determining  the net  asset value of  shares of the
Fund, assets or liabilities initially expressed in terms of Japanese yen will be
translated into U.S. dollars at the current selling rate of Japanese yen against
U.S. dollars. As a result,  in the absence of  a successful currency hedge,  the
value of the Fund's assets as measured in U.S. dollars may be affected favorably
or unfavora-
 
                                                                               7
<PAGE>
bly by fluctuations in the value of Japanese yen relative to the U.S. dollar.
 
NATURAL  DISASTERS.   In the past,  Japan has experienced  earthquakes and tidal
waves varying  in degrees  of severity,  and the  risks of  such phenomena,  and
damage resulting therefrom, continue to exist.
 
GENERAL  RISKS OF INVESTING  IN JAPANESE AND OTHER  FOREIGN SECURITIES.  Foreign
securities investments may be affected by changes in currency rates or  exchange
control  regulations,  changes  in governmental  administration  or  economic or
monetary policy (in the  United States and abroad)  or changed circumstances  in
dealings between nations. Fluctuations in the relative rates of exchange between
the  currencies  of  different  nations  will affect  the  value  of  the Fund's
investments  denominated  in  foreign  currency.  Changes  in  foreign  currency
exchange  rates relative to the U.S. dollar will affect the U.S. dollar value of
the Fund's  assets denominated  in that  currency and  thereby impact  upon  the
Fund's total return on such assets.
 
    Foreign  currency  exchange rates  are determined  by  forces of  supply and
demand on the foreign exchange markets. These forces are themselves affected  by
the   international  balance  of  payments  and  other  economic  and  financial
conditions, government intervention,  speculation and  other factors.  Moreover,
foreign currency exchange rates may be affected by the regulatory control of the
exchanges  on which the  currencies trade. The  foreign currency transactions of
the Fund will be conducted on a  spot basis or through forward foreign  currency
exchange  contracts  (described below).  The Fund  will  incur certain  costs in
connection with these currency transactions.
 
    Investments in  foreign  securities will  also  occasion risks  relating  to
political  and  economic  developments  abroad,  including  the  possibility  of
expropriations or confiscatory taxation, limitations  on the use or transfer  of
Fund   assets  and  any  effects  of   foreign  social,  economic  or  political
instability. Foreign companies are not subject to the regulatory requirements of
U.S. companies and, as  such, there may be  less publicly available  information
about  such companies.  Moreover, foreign companies  are not  subject to uniform
accounting,  auditing  and  financial   reporting  standards  and   requirements
comparable to those applicable to U.S. companies.
 
    Securities  of foreign issuers may be less liquid than comparable securities
of U.S.  issuers  and,  as such,  their  price  changes may  be  more  volatile.
Furthermore,  foreign exchanges and broker-dealers are generally subject to less
government  and   exchange  scrutiny   and   regulation  than   their   American
counterparts.  Brokerage commissions,  dealer concessions  and other transaction
costs may be higher on foreign markets than in the U.S. In addition, differences
in clearance and settlement procedures on foreign markets may occasion delays in
settlements of  the  Fund's  trades  effected in  such  markets.  As  such,  the
inability  to dispose  of portfolio  securities due  to settlement  delays could
result in  losses to  the  Fund due  to subsequent  declines  in value  of  such
securities and the inability of the Fund to make intended security purchases due
to settlement problems could result in a failure of the Fund to make potentially
advantageous investments.
 
REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which may
be  viewed as a type of secured lending by the Fund, and which typically involve
the acquisition  by  the Fund  of  debt  securities, from  a  selling  financial
institution  such as a bank, savings and loan association, or broker-dealer. The
agreement provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a fixed time in the  future, usually not more than  seven days from the date  of
purchase.  While repurchase agreements involve certain risks not associated with
direct investments  in  debt  securities,  including the  risks  of  default  or
bankruptcy  of the selling financial institution, the Fund follows procedures to
minimize such risks. These procedures include effecting repurchase  transactions
only  with large,  well-capitalized and  well-established financial institutions
and maintaining adequate collateralization.
 
REVERSE REPURCHASE AGREEMENTS AND DOLLAR ROLLS.   The Fund may also use  reverse
repurchase  agreements  and dollar  rolls as  part  of its  investment strategy.
Reverse repurchase  agreements involve  sales by  the Fund  of portfolio  assets
concurrently  with an agreement by  the Fund to repurchase  the same assets at a
later date at a fixed price. The Fund  may enter into dollar rolls in which  the
Fund  sells securities and simultaneously  contracts to repurchase substantially
similar (same type and  coupon) securities on a  specified future date.  Reverse
repurchase agreements and dollar rolls involve the risk that the market value of
the  securities  the Fund  is obligated  to repurchase  under the  agreement may
decline below the repurchase price. In the event the buyer of securities under a
reverse repurchase  agreement or  dollar roll  files for  bankruptcy or  becomes
insolvent, the Fund's use of proceeds of the agreement may be restricted pending
a  determination by  the other  party, or  its trustee  or receiver,  whether to
enforce the Fund's obligation to  repurchase the securities. Reverse  repurchase
agreements  and dollar rolls are  speculative techniques involving leverage, and
are considered borrowings by the Fund.
 
WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From  time
to time, in the ordinary course of business, the Fund may purchase securities on
a  when-issued or delayed delivery basis or may purchase or sell securities on a
forward commitment basis. When  such transactions are  negotiated, the price  is
fixed  at the time of the commitment, but  delivery and payment can take place a
month or more after the date of the commitment. There is no overall limit on the
percentage of  the Fund's  assets which  may  be committed  to the  purchase  of
securities on a
 
8
<PAGE>
when-issued,  delayed delivery or  forward commitment basis.  An increase in the
percentage of the  Fund's assets committed  to the purchase  of securities on  a
when-issued,  delayed  delivery or  forward  commitment basis  may  increase the
volatility of the Fund's net asset value.
 
WHEN, AS AND IF ISSUED SECURITIES.  The Fund may purchase securities on a "when,
as and if issued" basis  under which the issuance  of the security depends  upon
the  occurrence of a subsequent  event, such as approval  of a merger, corporate
reorganization, leveraged buyout or debt restructuring. If the anticipated event
does not occur and  the securities are  not issued, the Fund  will have lost  an
investment  opportunity.  There is  no overall  limit on  the percentage  of the
Fund's assets which may be committed to  the purchase of securities on a  "when,
as  and if  issued" basis. An  increase in  the percentage of  the Fund's assets
committed to the purchase of securities on a "when, as and if issued" basis  may
increase the volatility of its net asset value.
 
ZERO  COUPON SECURITIES.  A portion  of the fixed-income securities purchased by
the Fund  may be  zero coupon  securities. Such  securities are  purchased at  a
discount from their face amount, giving the purchaser the right to receive their
full  value at maturity. The interest  earned on such securities is, implicitly,
automatically compounded and paid out at  maturity. While such compounding at  a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest  if  prevailing interest  rates  decline, the  owner  of a  zero coupon
security will be  unable to participate  in higher yields  upon reinvestment  of
interest  received on  interest-paying securities  if prevailing  interest rates
rise.
 
    A zero  coupon security  pays no  interest to  its holder  during its  life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive  current cash available  for distribution to  shareholders. In addition,
zero coupon securities are subject  to substantially greater price  fluctuations
during  periods  of  changing  prevailing  interest  rates  than  are comparable
securities which  pay interest  on  a current  basis.  Current federal  tax  law
requires  that a holder  (such as the Fund)  of a zero  coupon security accrue a
portion of the discount at which the security was purchased as income each  year
even  though the  Fund receives  no interest  payments in  cash on  the security
during the year.
 
PRIVATE PLACEMENTS.   The  Fund may  invest  up to  5% of  its total  assets  in
securities  which are  subject to restrictions  on resale because  they have not
been registered under the  Securities Act of 1933,  as amended (the  "Securities
Act"),  or which are otherwise not  readily marketable. (Securities eligible for
resale pursuant to  Rule 144A  under the Securities  Act, and  determined to  be
liquid  pursuant to the procedures discussed in the following paragraph, are not
subject to the foregoing restriction.)  These securities are generally  referred
to  as private placements or restricted securities. Limitations on the resale of
such securities  may have  an adverse  effect on  their marketability,  and  may
prevent  the Fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of  registering such securities for resale and  the
risk of substantial delays in effecting such registration.
 
    The  Securities  and Exchange  Commission has  adopted  Rule 144A  under the
Securities Act,  which  permits  the  Fund  to  sell  restricted  securities  to
qualified  institutional  buyers  without  limitation.  The  Investment Manager,
pursuant to  procedures  adopted  by the  Trustees  of  the Fund,  will  make  a
determination  as to the liquidity of  each restricted security purchased by the
Fund. If a restricted security is determined to be "liquid," such security  will
not  be included within the category  "illiquid securities," which under current
policy may not  exceed 15%  of the  Fund's net  assets. Investing  in Rule  144A
securities  could have the effect of increasing the level of Fund illiquidity to
the extent  the Fund,  at a  particular point  in time,  may be  unable to  find
qualified institutional buyers interested in purchasing such securities.
 
OPTIONS  AND FUTURES TRANSACTIONS.  The Fund  may purchase and sell (write) call
and put options on (i) portfolio securities which are denominated in either U.S.
dollars or foreign currencies; (ii) stock indexes; and (iii) the U.S. dollar and
foreign currencies. Such options are or may  in the future be listed on  several
U.S.  and  foreign securities  exchanges or  may  be traded  in over-the-counter
transactions ("OTC options"). OTC options  are purchased from or sold  (written)
to  dealers or financial institutions which  have entered into direct agreements
with the Fund.
 
    The Fund is permitted to write covered call options on portfolio  securities
and  the U.S. dollar  and foreign currencies,  without limit, in  order to hedge
against the  decline in  the  value of  a security  or  currency in  which  such
security  is denominated  (although such  hedge is limited  to the  value of the
premium received) and  to close  out long call  option positions.  The Fund  may
write  covered put options, under which the Fund incurs an obligation to buy the
security (or currency) underlying  the option from the  purchaser of the put  at
the  option's  exercise price  at  any time  during  the option  period,  at the
purchaser's election.
 
    The Fund  may  purchase listed  and  OTC call  and  put options  in  amounts
equalling  up to 5% of  its total assets. The Fund  may purchase call options to
close out a covered call position or to protect against an increase in the price
of a security it  anticipates purchasing or,  in the case of  call options on  a
foreign  currency,  to hedge  against  an adverse  exchange  rate change  of the
currency  in  which  the  security  it  anticipates  purchasing  is  denominated
vis-a-vis  the currency in which the exercise price is denominated. The Fund may
purchase put options on  securities which it holds  in its portfolio to  protect
itself  against a decline in the value of  the security and to close out written
put positions in a manner similar to call option closing purchase  transactions.
There are no limits on the Fund's ability to purchase call and put options other
than compliance with the foregoing policies.
 
                                                                               9
<PAGE>
    The  Fund may purchase and sell futures contracts that are currently traded,
or may in  the future  be traded,  on U.S.  and foreign  commodity exchanges  on
underlying  portfolio securities, on any  currency ("currency" futures), on U.S.
and foreign  fixed-income  securities  ("interest rate"  futures)  and  on  such
indexes  of U.S. or  foreign equity or  fixed-income securities as  may exist or
come into being ("index" futures). The  Fund may purchase or sell interest  rate
futures  contracts for the  purpose of hedging some  or all of  the value of its
portfolio securities (or  anticipated portfolio securities)  against changes  in
prevailing interest rates. The Fund may purchase or sell index futures contracts
for  the  purpose  of  hedging  some or  all  of  its  portfolio  securities (or
anticipated portfolio securities) against changes in their prices. The Fund  may
purchase or sell currency futures contracts to hedge against an anticipated rise
or  decline  in the  value  of the  currency in  which  a portfolio  security is
denominated vis-a-vis another  currency. As  a futures  contract purchaser,  the
Fund  incurs  an  obligation to  take  delivery  of a  specified  amount  of the
obligation underlying  the contract  at a  specified time  in the  future for  a
specified  price.  As  a  seller  of a  futures  contract,  the  Fund  incurs an
obligation to deliver  the specified amount  of the underlying  obligation at  a
specified time in return for an agreed upon price.
 
    The  Fund  also may  purchase  and write  call  and put  options  on futures
contracts which are traded  on an exchange and  enter into closing  transactions
with respect to such options to terminate an existing position.
 
    New  futures  contracts, options  and other  financial products  and various
combinations thereof continue to be developed.  The Fund may invest in any  such
futures,  options or products as may be developed, to the extent consistent with
its investment objective and applicable regulatory requirements.
 
RISKS OF OPTIONS AND FUTURES TRANSACTIONS.  The Fund may close out its  position
as writer of an option, or as a buyer or seller of a futures contract, only if a
liquid  secondary market exists for options or futures contracts of that series.
There is no assurance that such a market will exist, particularly in the case of
OTC options, as such options may generally only be closed out by entering into a
closing purchase transaction  with the  purchasing dealer.  Also, exchanges  may
limit  the amount by which  the price of many futures  contracts may move on any
day. If the price moves  equal the daily limit on  successive days, then it  may
prove  impossible to  liquidate a futures  position until the  daily limit moves
have ceased.
 
    Futures contracts and options transactions may be considered speculative  in
nature  and may  involve greater risks  than those customarily  assumed by other
investment companies which do not invest  in such instruments. One such risk  is
that   the  Investment  Manager  or  Sub-Adviser   could  be  incorrect  in  its
expectations as to  the direction or  extent of various  interest rate or  price
movements  or the time span within which  the movements take place. For example,
if the Fund sold futures contracts for the sale of securities in anticipation of
an increase  in interest  rates,  and then  interest  rates went  down  instead,
causing bond prices to rise, the Fund would lose money on the sale. Another risk
which  will arise  in employing futures  contracts to protect  against the price
volatility of portfolio securities is that the prices of securities,  currencies
and  indexes  subject to  futures contracts  (and  thereby the  futures contract
prices) may correlate  imperfectly with  the behavior  of the  U.S. dollar  cash
prices  of the Fund's portfolio securities and their denominated currencies. See
the Statement of Additional Information for a further discussion of risks.
 
NON-DIVERSIFIED STATUS.  The Fund  is a non-diversified investment company  and,
as  such, is not  subject to the diversification  requirements of the Investment
Company  Act  of  1940,  as  amended  (the  "Investment  Company  Act").  As   a
non-diversified investment company, the Fund may invest a greater portion of its
assets  in the  securities of  a single  issuer and  thus is  subject to greater
exposure to  risks such  as  a decline  in the  credit  rating of  that  issuer.
However,  the Fund  anticipates that it  will qualify as  a regulated investment
company under the federal income tax laws and, if so qualified, will be  subject
to  the applicable diversification requirements of the Internal Revenue Code, as
amended (the "Code"). As a regulated investment company under the Code, the Fund
may not, as of the  end of any of its  fiscal quarters, have invested more  than
25% of its total assets in the securities of any one issuer (including a foreign
government), or as to 50% of its total assets, have invested more than 5% of its
total assets in the securities of a single issuer.
 
FORWARD  FOREIGN CURRENCY EXCHANGE  CONTRACTS.  The Fund  may enter into forward
foreign currency exchange contracts ("forward contracts") in connection with its
foreign securities investments.
 
    A forward contract involves an obligation to purchase or sell a currency  at
a  future date,  which may  be any  fixed number  of days  from the  date of the
contract agreed upon by the parties, at a price set at the time of the contract.
The Fund may  enter into forward  contracts as a  hedge against fluctuations  in
future foreign exchange rates.
 
    The Fund will enter into forward contracts under various circumstances. When
the  Fund  enters  into  a contract  for  the  purchase or  sale  of  a security
denominated in a foreign currency, it may, for example, desire to "lock in"  the
price  of the security in U.S. dollars  or some other foreign currency which the
Fund is  temporarily  holding in  its  portfolio.  By entering  into  a  forward
contract  for  the purchase  or sale,  for a  fixed amount  of dollars  or other
currency, of the amount of foreign currency involved in the underlying  security
transactions,  the Fund will be  able to protect itself  against a possible loss
resulting from an adverse change in the relationship between the U.S. dollar  or
other currency
 
10
<PAGE>
which  is being used for the security purchase (by the Fund or the counterparty)
and the foreign currency in which the security is denominated during the  period
between  the date  on which the  security is purchased  or sold and  the date on
which payment is made or received.
 
    At other  times,  when,  for  example,  the  Fund's  Investment  Manager  or
Sub-Adviser believe that the currency of a particular foreign country may suffer
a  substantial decline against  the U.S. dollar or  some other foreign currency,
the Fund  may enter  into a  forward contract  to sell,  for a  fixed amount  of
dollars  or other  currency, the  amount of  foreign currency  approximating the
value of some or all of the Fund's securities holdings (or securities which  the
Fund  has purchased  for its  portfolio) denominated  in such  foreign currency.
Under identical circumstances,  the Fund may  enter into a  forward contract  to
sell, for a fixed amount of U.S. dollars or other currency, an amount of foreign
currency  other  than the  currency in  which  the securities  to be  hedged are
denominated approximating the value of some  or all of the portfolio  securities
to  be hedged. This method of  hedging, called "cross-hedging," will be selected
by the Investment Manager or Sub-Adviser when it is determined that the  foreign
currency  in  which the  portfolio securities  are denominated  has insufficient
liquidity or  is trading  at a  discount  as compared  with some  other  foreign
currency with which it tends to move in tandem.
 
    In  addition, when the  Fund's Investment Manager  or Sub-Adviser anticipate
purchasing securities  at some  time in  the future,  and wish  to lock  in  the
current  exchange rate of the currency in which those securities are denominated
against the U.S. dollar or some other foreign currency, the Fund may enter  into
a forward contract to purchase an amount of currency equal to some or all of the
value  of the anticipated purchase, for a  fixed amount of U.S. dollars or other
currency. The  Fund  may,  however,  close  out  the  forward  contract  without
purchasing the security which was the subject of the "anticipatory" hedge.
 
    In  all of  the above  circumstances, if  the currency  in which  the Fund's
securities holdings (or anticipated portfolio securities) are denominated  rises
in  value with respect to  the currency which is  being purchased (or sold), the
Fund will have  realized fewer  gains than  had the  Fund not  entered into  the
forward  contracts.  Moreover,  the  precise matching  of  the  forward contract
amounts and the value of the securities involved will not generally be possible,
since the future value of such securities in foreign currencies will change as a
consequence of market  movements in the  value of those  securities between  the
date  the forward contract is entered into and  the date it matures. The Fund is
not required  to  enter  into  such transactions  with  regard  to  its  foreign
currency-denominated  securities and will not do so unless deemed appropriate by
the Investment Manager or Sub-Adviser. The Fund generally will not enter into  a
forward  contract with a  term of greater  than one year,  although it may enter
into forward contracts for periods of up to five years. The Fund may be  limited
in its ability to enter into hedging transactions involving forward contracts by
the  Internal Revenue Code requirements relating to qualification as a regulated
investment company (see "Dividends, Distributions and Taxes").
 
RIGHTS AND WARRANTS.   The  Fund may acquire  rights and/or  warrants which  are
attached  to  other  securities in  its  portfolio,  or which  are  issued  as a
distribution by the issuer  of a security held  in its portfolio. Rights  and/or
warrants  are, in  effect, options to  purchase equity securities  at a specific
price, generally valid for a specific period of time, and have no voting rights,
pay no dividends  and have  no rights with  respect to  the corporation  issuing
them.
 
LOWER  RATED CONVERTIBLE  AND FIXED-INCOME  SECURITIES.   The Fund  may acquire,
through purchase or  a distribution  by the  issuer of  a security  held in  its
portfolio, a fixed-income security which is convertible into common stock of the
issuer.  Convertible securities rank senior to  common stocks in a corporation's
capital structure and, therefore, entail less risk than the corporation's common
stock. The value  of a  convertible security is  a function  of its  "investment
value"  (its  value as  if  it did  not have  a  conversion privilege),  and its
"conversion value" (the  security's worth  if it were  to be  exchanged for  the
underlying security, at market value, pursuant to its conversion privilege).
 
    To the extent that a convertible security's investment value is greater than
its  conversion  value,  its  price  will  be  primarily  a  reflection  of such
investment value and its  price will be likely  to increase when interest  rates
fall and decrease when interest rates rise, as with a fixed-income security (the
credit  standing of the issuer and other factors  may also have an effect on the
convertible security's value).  If the conversion  value exceeds the  investment
value,  the price  of the  convertible security  will rise  above its investment
value and, in  addition, will sell  at some premium  over its conversion  value.
(This  premium  represents  the  price  investors are  willing  to  pay  for the
privilege of purchasing a  fixed-income security with  a possibility of  capital
appreciation  due to the conversion  privilege.) At such times  the price of the
convertible security  will tend  to fluctuate  directly with  the price  of  the
underlying equity security.
 
    A  portion of the fixed-income and  convertible securities in which the Fund
may invest  are not  rated; when  rated, such  ratings will  generally be  below
investment  grade. Securities below investment grade  are the equivalent of high
yield, high risk  bonds, commonly  known as  "junk bonds."  Investment grade  is
generally  considered to be  debt securities rated  BBB or higher  by Standard &
Poor's Corporation ("S&P") or Baa or  higher by Moody's Investors Service,  Inc.
("Moody's").  However, the Fund will  not invest in debt  securities that are in
default in payment of principal or interest.
 
                                                                              11
<PAGE>
    Because of the special nature of  the Fund's permitted investments in  lower
rated  debt securities, the Investment Manager and Sub-Adviser must take account
of certain special considerations  in assessing the  risks associated with  such
investments.  The prices of  lower rated securities  have been found  to be less
sensitive to changes in prevailing interest rates than higher rated investments,
but are likely to  be more sensitive to  adverse economic changes or  individual
corporate  developments. During  an economic  downturn or  substantial period of
rising interest rates, highly leveraged issuers may experience financial  stress
which  would  adversely  affect their  ability  to service  their  principal and
interest payment  obligations, to  meet  their projected  business goals  or  to
obtain  additional financing. If the issuer  of a fixed-income security owned by
the Fund defaults, the Fund may  incur additional expenses to seek recovery.  In
addition,  periods of economic uncertainty and  change can be expected to result
in an increased  volatility of  market prices of  lower rated  securities and  a
corresponding volatility in the net asset value of a share of the Fund.
 
PORTFOLIO MANAGEMENT
 
The  Fund's  portfolio is  actively managed  by its  Investment Manager  and the
Sub-Adviser with  a  view  to  achieving the  Fund's  investment  objective.  In
determining  which securities  to purchase  for the Fund  or hold  in the Fund's
portfolio, the Investment Manager and  the Sub-Adviser will rely on  information
from various sources, including research, analysis and appraisals of brokers and
dealers,  the  views  of Trustees  of  the  Fund and  others  regarding economic
developments  and  interest  rate  trends,  and  the  Investment  Manager's  and
Sub-Adviser's  own analysis  of factors they  deem relevant.  The Fund's primary
portfolio manager is  William G.M. Thomas,  an Investment Director  of the  Sub-
Adviser.  Mr. Thomas has been managing equity portfolios for the Sub-Adviser for
over ten years.
 
    Personnel  of  the  Investment  Manager  and  Sub-Adviser  have  substantial
experience  in the  use of the  investment techniques described  above under the
heading "Options  and Futures  Transactions,"  which techniques  require  skills
different  from  those  needed  to select  the  portfolio  securities underlying
various options and futures contracts.
 
    Orders for  transactions  in portfolio  securities  and commodities  may  be
placed  for the Fund with a number of brokers and dealers, including DWR and two
affiliated broker-dealers of the Sub-Adviser (Morgan Grenfell Asia and  Partners
Securities  Pte.  Limited  and  Morgan  Grenfell  Asia  Securities  (Hong  Kong)
Limited). Pursuant to an  order of the Securities  and Exchange Commission,  the
Fund  may effect principal transactions in certain money market instruments with
Dean Witter Reynolds Inc. ("DWR"),  a broker-dealer affiliate of the  Investment
Manager.  In addition, the Fund may  incur brokerage commissions on transactions
conducted through DWR and the  two above-mentioned affiliated broker-dealers  of
the Sub-Adviser.
 
    Although  the Fund does not  intend to engage in  short-term trading, it may
sell portfolio securities without  regard to the length  of time they have  been
held  when such  sale will,  in the  opinion of  the Investment  Manager or Sub-
Adviser, contribute to the  Fund's investment objective.  It is not  anticipated
that the Fund's portfolio turnover rate will exceed 100% in any one year.
 
    The  expenses of the Fund relating to its portfolio management are likely to
be greater than those incurred by other investment companies investing primarily
in  securities  issued  by  domestic  issuers  as  custodial  costs,   brokerage
commissions  and other  transaction charges  related to  investing in  Japan and
other foreign markets are generally higher than in the United States.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed below  are among the restrictions which  have
been  adopted by the Fund as  fundamental policies. Under the Investment Company
Act, a fundamental policy may not be  changed without the vote of a majority  of
the  outstanding  voting securities  of the  Fund,  as defined  in the  Act. For
purposes of  the following  limitations: (i)  all percentage  limitations  apply
immediately  after a  purchase or  initial investment,  and (ii)  any subsequent
change in any applicable percentage resulting from market fluctuations or  other
changes in total or net assets does not require elimination of any security from
the portfolio.
 
    The Fund may not:
 
        1.  Invest 25% or more of the value of its total assets in securities of
    issuers in any one industry. This restriction does not apply to  obligations
    issued  or  guaranteed  by the  United  States Government,  its  agencies or
    instrumentalities.
 
        2. Invest more than 5% of the value of its total assets in securities of
    issuers having  a record,  together with  predecessors, of  less than  three
    years  of  continuous operation.  This restriction  shall  not apply  to any
    obligation issued  or  guaranteed  by  the  United  States  Government,  its
    agencies or instrumentalities.
 
    In addition, as a non-fundamental policy, the Fund may not, as to 75% of its
total assets, purchase more than 10% of the voting securities of any issuer.
 
12
<PAGE>
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
The  Fund  offers its  shares  for sale  to the  public  on a  continuous basis.
Pursuant  to  a  Distribution  Agreement  between  the  Fund  and  Dean   Witter
Distributors  Inc. (the "Distributor"), an  affiliate of the Investment Manager,
shares of the Fund  are distributed by  the Distributor and  offered by DWR  and
other  dealers  who  have  entered  into  selected  dealer  agreements  with the
Distributor ("Selected Broker-Dealers"). The  principal executive office of  the
Distributor is located at Two World Trade Center, New York, New York 10048.
 
    The minimum initial purchase is $1,000. Minimum subsequent purchases of $100
or  more may  be made  by sending a  check, payable  to Dean  Witter Japan Fund,
directly to Dean Witter Trust Company  (the "Transfer Agent") at P.O. Box  1040,
Jersey  City, NJ  07303 or by  contacting an  account executive of  DWR or other
Selected Broker-Dealer. The minimum initial purchase in the case of  investments
through EasyInvest-SM-, an automatic purchase plan (see "Shareholder Services"),
is  $100, provided  that the  schedule of  automatic investments  will result in
investments totalling at  least $1,000 within  the first twelve  months. In  the
case  of investments pursuant  to Systematic Payroll  Deduction Plans (including
Individual  Retirement  Plans),  the  Fund,   in  its  discretion,  may   accept
investments  without  regard to  any minimum  amounts  which would  otherwise be
required if the  Fund has  reason to  believe that  additional investments  will
increase  the investment in  all accounts under  such Plans to  at least $1,000.
Certificates for shares purchased will not be issued unless a request is made by
the shareholder in writing to the Transfer Agent. The offering price will be the
net asset value  per share next  determined following receipt  of an order  (see
"Determination of Net Asset Value").
 
    Shares  of  the Fund  are sold  through  the Distributor  on a  normal three
business day settlement basis; that is, payment is due on the third business day
(settlement date) after the order is placed with the Distributor. Shares of  the
Fund  purchased through the  Distributor are entitled  to any dividends declared
beginning on the  next business  day following  settlement date.  Since DWR  and
other  Selected Broker-Dealers forward investors' funds on settlement date, they
will benefit  from the  temporary use  of the  funds if  payment is  made  prior
thereto.  Shares  purchased  through  the Transfer  Agent  are  entitled  to any
dividends declared beginning on  the next business day  following receipt of  an
order.  As noted above, orders  placed directly with the  Transfer Agent must be
accompanied by  payment. Investors  will be  entitled to  receive dividends  and
capital  gains distributions if their order is received by the close of business
on the day  prior to  the record  date for  such distributions.  While no  sales
charge  is imposed at the time shares are purchased, a contingent deferred sales
charge  may  be  imposed  at  the  time  of  redemption  (see  "Redemptions  and
Repurchases"). Sales personnel are compensated for selling shares of the Fund at
the  time of their sale by the Distributor and/or the Selected Broker-Dealer. In
addition, some  sales  personnel  of the  Selected  Broker-Dealer  will  receive
various  types of non-cash  compensation as special  sales incentives, including
trips, educational and/or business  seminars and merchandise.  The Fund and  the
Distributor reserve the right to reject any purchase orders.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act
(the  "Plan"), under which the Fund pays the Distributor a fee, which is accrued
daily and payable monthly, at an annual rate  of 1.0% of the lesser of: (a)  the
average  daily aggregate gross sales of the Fund's shares since the inception of
the  Fund  (not   including  reinvestments   of  dividends   or  capital   gains
distributions),  less the average daily aggregate  net asset value of the Fund's
shares redeemed  since the  Fund's inception  upon which  a contingent  deferred
sales  charge has been  imposed or waived;  or (b) the  Fund's average daily net
assets. This fee is treated by the Fund as an expense in the year it is accrued.
A portion of the fee payable pursuant to the Plan, equal to 0.25% of the  Fund's
average  daily net assets, is characterized as  a service fee within the meaning
of NASD  guidelines. The  service fee  is a  payment made  for personal  service
and/or the maintenance of shareholder accounts.
 
    Amounts  paid  under  the Plan  are  paid  to the  Distributor  for services
provided  and  the  expenses  borne  by  the  Distributor  and  others  in   the
distribution  of the  Fund's shares,  including the  payment of  commissions for
sales of the Fund's shares and  incentive compensation to and expenses of  DWR's
account executives and others who engage in or support distribution of shares or
who  service shareholder  accounts, including  overhead and  telephone expenses;
printing and distribution of  prospectuses and reports  used in connection  with
the  offering  of the  Fund's  shares to  other  than current  shareholders; and
preparation, printing  and  distribution  of sales  literature  and  advertising
materials.  In addition, the  Distributor may utilize fees  paid pursuant to the
Plan to compensate DWR and  other Selected Broker-Dealers for their  opportunity
costs  in advancing such amounts,  which compensation would be  in the form of a
carrying charge on any unreimbursed expenses.
 
    For the fiscal period  ended May 31, 1996,  the Fund accrued payments  under
the  Plan amounting to  $249,726, which amount  is equal to  1.00% of the Fund's
average daily net assets for the  fiscal period. The payments accrued under  the
Plan  were calculated pursuant  to clause (b) of  the compensation formula under
the Plan.
 
    At any given time, the expenses in distributing shares of the Fund may be in
excess of the total of (i) the payments  made by the Fund pursuant to the  Plan,
and   (ii)  the   proceeds  of  contingent   deferred  sales   charges  paid  by
inves-
 
                                                                              13
<PAGE>
tors upon the redemption of shares (see "Redemptions and Repurchases--Contingent
Deferred Sales Charge"). For example, if $1 million in expenses in  distributing
shares of the Fund had been incurred and $750,000 had been received as described
in  (i)  and  (ii) above,  the  excess  expense would  amount  to  $250,000. The
Distributor has advised the Fund that such excess amount, including the carrying
charge described above, totalled $15,017,815 at May 31, 1996, which was equal to
5.51% of the Fund's net assets on such date.
 
    Because there  is no  requirement under  the Plan  that the  Distributor  be
reimbursed  for all  distribution expenses or  any requirement that  the Plan be
continued from year to year, such excess  amount, if any, does not constitute  a
liability of the Fund. Although there is no legal obligation for the Fund to pay
expenses  incurred in excess of payments made to the Distributor under the Plan,
and the proceeds  of contingent deferred  sales charges paid  by investors  upon
redemption of shares, if for any reason the Plan is terminated the Trustees will
consider at that time the manner in which to treat such expenses. Any cumulative
expenses incurred, but not yet recovered through distribution fees or contingent
deferred  sales charges, may or may not be recovered through future distribution
fees or contingent deferred sales charges.
 
DETERMINATION OF NET ASSET VALUE
 
The net asset value per share of the Fund is determined once daily at 4:00 p.m.,
New York time, on each day that the New York Stock Exchange is open (or, on days
when the New  York Stock Exchange  closes prior  to 4:00 p.m.,  at such  earlier
time)  by  taking the  value  of all  assets of  the  Fund, subtracting  all its
liabilities, dividing by the number of  shares outstanding and adjusting to  the
nearest  cent. The  net asset  value per  share will  not be  determined on Good
Friday and on such other federal and non-federal holidays as are observed by the
New York Stock Exchange.
 
    In the calculation of  the Fund's net asset  value: (1) an equity  portfolio
security  listed or traded on  the New York or  American Stock Exchange or other
domestic or foreign stock exchange or quoted  by NASDAQ is valued at its  latest
sale  price on that exchange or quotation  service, prior to the time assets are
valued; if there were no  sales that day, the security  is valued at the  latest
bid  price (in cases where  a security is traded on  more than one exchange, the
security is valued on the exchange designated as the primary market pursuant  to
procedures  adopted by the Trustees); and (2) all other portfolio securities for
which over-the-counter market quotations are readily available are valued at the
latest bid price. When  market quotations are  not readily available,  including
circumstances  under which it is determined  by the Investment Manager that sale
and bid  prices are  not  reflective of  a  security's market  value,  portfolio
securities  are valued  at their  fair value as  determined in  good faith under
procedures established by  and under  the general  supervision of  the Board  of
Trustees.  For valuation  purposes, quotations of  foreign portfolio securities,
other assets and liabilities  and forward contracts  stated in foreign  currency
are translated into U.S. dollar equivalents at the prevailing market rates prior
to the close of the New York Stock Exchange. Dividends receivable are accrued as
of the ex-dividend date or as of the time that the relevant ex-dividend date and
amounts become known.
 
    Short-term  debt securities with remaining maturities  of sixty days or less
at the  time of  purchase are  valued  at amortized  cost, unless  the  Trustees
determine  such does  not reflect  the securities'  market value,  in which case
these securities  will  be valued  at  their fair  value  as determined  by  the
Trustees.
 
    Certain  of  the Fund's  portfolio securities  may be  valued by  an outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a matrix  system incorporating  security  quality, maturity  and coupon  as  the
evaluation model parameters, and/or research evaluations by its staff, including
review of broker-dealer market price quotations, in determining what it believes
is  the  fair  valuation of  the  portfolio  securities valued  by  such pricing
service.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
AUTOMATIC INVESTMENT OF DIVIDENDS AND  DISTRIBUTIONS.  All income dividends  and
capital gains distributions are automatically paid in full and fractional shares
of  the Fund (or, if specified by the shareholder, any other open-end investment
company for which InterCapital serves as investment manager (collectively,  with
the  Fund, the "Dean Witter Funds")),  unless the shareholder requests that they
be paid in  cash. Shares  as acquired  are not subject  to the  imposition of  a
contingent  deferred sales  charge upon  their redemption  (see "Redemptions and
Repurchases").
 
INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder who
receives a cash payment  representing a dividend  or capital gains  distribution
may  invest such dividend or distribution at  the net asset value per share next
determined after receipt by  the Transfer Agent, by  returning the check or  the
proceeds to the Transfer Agent within thirty days after the payment date. Shares
so  acquired are not  subject to the  imposition of a  contingent deferred sales
charge upon their redemption (see "Redemptions and Repurchases").
 
14
<PAGE>
EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic purchase
plan  which  provides for  any  amount from  $100  to $5,000  to  be transferred
automatically from a checking or savings account, on a semi-monthly, monthly  or
quarterly basis, to the Transfer Agent for investment in shares of the Fund (see
"Purchase   of  Fund  Shares"   and  "Redemptions  and  Repurchases--Involuntary
Redemption").
 
SYSTEMATIC WITHDRAWAL  PLAN.   A  systematic  withdrawal plan  (the  "Withdrawal
Plan")  is available  for shareholders  who own or  purchase shares  of the Fund
having a minimum value of $10,000 based  upon the then current net asset  value.
The  Withdrawal Plan provides  for monthly or  quarterly (March, June, September
and December) checks in any  dollar amount, not less than  $25, or in any  whole
percentage  of  the  account balance,  on  an annualized  basis.  Any applicable
contingent deferred sales charge  will be imposed on  shares redeemed under  the
Withdrawal  Plan  (see "Redemptions  and Repurchases--Contingent  Deferred Sales
Charge"). Therefore, any shareholder participating  in the Withdrawal Plan  will
have  sufficient shares redeemed  from his or  her account so  that the proceeds
(net of any applicable contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.
 
    Withdrawal Plan payments should  not be considered  as dividends, yields  or
income.  If periodic withdrawal plan payments continuously exceed net investment
income and  net capital  gains, the  shareholder's original  investment will  be
correspondingly reduced and ultimately exhausted.
 
    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
TAX-SHELTERED RETIREMENT  PLANS.   Retirement  plans are  available for  use  by
corporations,  the self-employed,  Individual Retirement  Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of  such
plans should be on advice of legal counsel or tax adviser.
 
    For  further information  regarding plan administration,  custodial fees and
other details,  investors should  contact  their DWR  or other  Selected  Dealer
account executive or the Transfer Agent.
 
EXCHANGE PRIVILEGE
 
The  Fund makes available  to its shareholders  an "Exchange Privilege" allowing
the exchange of shares of  the Fund for shares of  other Dean Witter Funds  sold
with  a contingent deferred sales charge ("CDSC  funds"), and for shares of Dean
Witter Short-Term U.S. Treasury  Trust, Dean Witter  Short-Term Bond Fund,  Dean
Witter  Limited Term  Municipal Trust,  Dean Witter  Balanced Growth  Fund, Dean
Witter Balanced Income Fund, Dean  Witter Intermediate Term U.S. Treasury  Trust
and  five Dean Witter Funds  which are money market  funds (the foregoing eleven
non-CDSC funds  are  hereinafter  collectively  referred  to  as  the  "Exchange
Funds"). Exchanges may be made after the shares of the Fund acquired by purchase
(not by exchange or dividend reinvestment) have been held for thirty days. There
is  no waiting period for  exchanges of shares acquired  by exchange or dividend
reinvestment.
 
    An exchange to another CDSC fund or to any Exchange Fund that is not a money
market fund is on the basis of the next calculated net asset value per share  of
each  fund after the  exchange order is  received. When exchanging  into a money
market fund from the Fund,  shares of the Fund are  redeemed out of the Fund  at
their  next calculated net  asset value and  the proceeds of  the redemption are
used to  purchase  shares of  the  money market  fund  at the  net  asset  value
determined  the following business day. Subsequent  exchanges between any of the
money market funds and any of the CDSC funds can be effected on the same  basis.
No  contingent deferred  sales charge  ("CDSC") is  imposed at  the time  of any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different CDSC schedule  than that  of this  Fund will  be subject  to the  CDSC
schedule  of this  Fund, even if  such shares are  subsequently re-exchanged for
shares of the  CDSC fund  originally purchased. During  the period  of time  the
shareholder  remains in the Exchange  Fund (calculated from the  last day of the
month in which the Exchange Fund shares were acquired), the holding period  (for
the  purpose of determining the rate of the CDSC) is frozen. If those shares are
subsequently  reexchanged  for  shares  of  a  CDSC  fund,  the  holding  period
previously  frozen when the first  exchange was made resumes  on the last day of
the month in which shares of a CDSC fund are reacquired. Thus, the CDSC is based
upon the time (calculated as described above) the shareholder was invested in  a
CDSC fund (see "Redemptions and Repurchases--Contingent Deferred Sales Charge").
However,  in  the  case  of  shares exchanged  into  an  Exchange  Fund,  upon a
redemption of shares which  results in a  CDSC being imposed,  a credit (not  to
exceed  the amount of the CDSC) will be given in an amount equal to the Exchange
Fund  12b-1  distribution  fees  incurred  on  or  after  that  date  which  are
attributable  to  those  shares.  (Exchange  Fund  12b-1  distribution  fees are
described in the prospectuses for those funds.)
 
    In addition, shares of the  Fund may be acquired  in exchange for shares  of
Dean  Witter Funds sold  with a front-end sales  charge ("front-end sales charge
funds"), but shares  of the  Fund, however acquired,  may not  be exchanged  for
shares  of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired in
exchange for shares of a front-end sales charge fund (or in exchange for  shares
of  other Dean Witter  Funds for which  shares of a  front-end sales charge fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
                                                                              15
<PAGE>
    Purchases and  exchanges should  be  made for  investment purposes  only.  A
pattern  of frequent  exchanges may  be deemed by  the Investment  Manager to be
abusive and contrary to the best interests of the Fund's other shareholders and,
at the Investment Manager's discretion, may be limited by the Fund's refusal  to
accept  additional purchases  and/or exchanges  from the  investor. Although the
Fund does not  have any  specific definition of  what constitutes  a pattern  of
frequent  exchanges,  and  will  consider all  relevant  factors  in determining
whether a particular situation is abusive and contrary to the best interests  of
the Fund and its other shareholders, investors should be aware that the Fund and
each  of the other Dean Witter Funds  may in their discretion limit or otherwise
restrict the number  of times this  Exchange Privilege may  be exercised by  any
investor.  Any such restriction will be made  by the Fund on a prospective basis
only, upon notice  of the  shareholder not later  than ten  days following  such
shareholder's  most  recent  exchange.  Also,  the  Exchange  Privilege  may  be
terminated or revised at  any time by  the Fund and/or any  of such Dean  Witter
Funds  for which shares of the Fund have been exchanged, upon such notice as may
be required by applicable  regulatory agencies. Shareholders maintaining  margin
accounts  with  DWR  or another  Selected  Broker-Dealer are  referred  to their
account executive  regarding restrictions  on  exchange of  shares of  the  Fund
pledged in the margin account.
 
    The  current prospectus for each  fund describes its investment objective(s)
and policies, and  shareholders should obtain  a copy and  examine it  carefully
before  investing. Exchanges are  subject to the  minimum investment requirement
and any other conditions imposed  by each fund. In  the case of any  shareholder
holding  a share certificate or certificates, no exchanges may be made until all
applicable share  certificates have  been  received by  the Transfer  Agent  and
deposited  in the Shareholder's account. An exchange will be treated for federal
income tax purposes the same as a  repurchase or redemption of shares, on  which
the  shareholder may  realize a  capital gain or  loss. However,  the ability to
deduct capital losses on an exchange may be limited in situations where there is
an exchange of  shares within ninety  days after the  shares are purchased.  The
Exchange  Privilege is only available in states where an exchange may legally be
made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account  numbers  are part  of  the account  information,  shareholders  may
initiate  an exchange of shares of the Fund for shares of any of the Dean Witter
Funds (for which the Exchange Privilege is available) pursuant to this  Exchange
Privilege   by  contacting  their  account   executive  (no  Exchange  Privilege
Authorization Form is required). Other shareholders (and those shareholders  who
are  clients  of DWR  or another  Selected  Broker-Dealer but  who wish  to make
exchanges directly by writing or  telephoning the Transfer Agent) must  complete
and  forward to  the Transfer  Agent an  Exchange Privilege  Authorization Form,
copies of  which  may  be obtained  from  the  Transfer Agent,  to  initiate  an
exchange. If the Authorization Form is used, exchanges may be made in writing or
by contacting the Transfer Agent at (800) 869-NEWS (toll-free).
 
    The  Fund  will  employ  reasonable  procedures  to  confirm  that  exchange
instructions communicated over  the telephone are  genuine. Such procedures  may
include requiring various forms of personal identification such as name, mailing
address,  social security  or other tax  identification number and  DWR or other
Selected Broker-Dealer account number (if any). Telephone instructions may  also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent  between 9:00 a.m. and 4:00  p.m., New York time, on  any day the New York
Stock Exchange is  open. Any  shareholder wishing to  make an  exchange who  has
previously  filed an Exchange Privilege Authorization  Form and who is unable to
reach the Fund  by telephone should  contact his  or her DWR  or other  Selected
Broker-Dealer  account  executive, if  appropriate, or  make a  written exchange
request. Shareholders are  advised that  during periods of  drastic economic  or
market  changes, it  is possible that  the telephone exchange  procedures may be
difficult to implement, although this has not been the experience with the  Dean
Witter Funds in the past.
 
    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive  or  the Transfer  Agent  for further  information  about  the
Exchange Privilege.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
REDEMPTION.   Shares of the Fund can be redeemed for cash at any time at the net
asset value per share next determined; however, such redemption proceeds may  be
reduced  by the amount of any  applicable contingent deferred sales charges (see
below).  If  shares  are  held  in  a  shareholder's  account  without  a  share
certificate,  a written request for redemption sent to the Fund's Transfer Agent
at P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held  by
the  shareholder(s), the shares may be redeemed by surrendering the certificates
with a written  request for  redemption, along with  any additional  information
required by the Transfer Agent.
 
16
<PAGE>
CONTINGENT  DEFERRED SALES CHARGE.   Shares of  the Fund which  are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased)  will not be subject  to any charge upon  redemption.
Shares redeemed sooner than six years after purchase may, however, be subject to
a  charge upon  redemption. This charge  is called a  "contingent deferred sales
charge" ("CDSC"), which  will be  a percentage of  the dollar  amount of  shares
redeemed  and will be assessed  on an amount equal to  the lesser of the current
market value  or  the cost  of  the shares  being  redeemed. The  size  of  this
percentage  will depend upon how long the shares have been held, as set forth in
the table below:
 
<TABLE>
<CAPTION>
                                             CONTINGENT DEFERRED
               YEAR SINCE                       SALES CHARGE
                PURCHASE                     AS A PERCENTAGE OF
              PAYMENT MADE                     AMOUNT REDEEMED
- -----------------------------------------  -----------------------
<S>                                        <C>
First....................................              5.0%
Second...................................              4.0%
Third....................................              3.0%
Fourth...................................              2.0%
Fifth....................................              2.0%
Sixth....................................              1.0%
Seventh and thereafter...................           None
</TABLE>
 
    A CDSC will not be imposed on:  (i) any amount which represents an  increase
in value of shares purchased within the six years preceding the redemption; (ii)
the current net asset value of shares purchased more than six years prior to the
redemption;  and (iii) the  current net asset value  of shares purchased through
reinvestment of dividends  or distributions and/or  shares acquired in  exchange
for  shares of Dean Witter Funds sold with  a front-end sales charge or of other
Dean Witter Funds acquired in exchange for such shares. Moreover, in determining
whether a CDSC is applicable it will  be assumed that amounts described in  (i),
(ii) and (iii) above (in that order) are redeemed first.
 
    In  addition, the CDSC, if otherwise applicable,  will be waived in the case
of:
 
    (1) redemptions of  shares held at  the time a  shareholder dies or  becomes
disabled,  only  if the  shares are:  (A) registered  either in  the name  of an
individual shareholder (not a  trust), or in the  names of such shareholder  and
his  or her spouse as joint tenants with right of survivorship; or (B) held in a
qualified corporate  or  self-employed retirement  plan,  Individual  Retirement
Account  ("IRA") or  Custodial Account under  Section 403(b)(7)  of the Internal
Revenue Code  ("403(b) Custodial  Account"), provided  in either  case that  the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2)   redemptions  in   connection  with   the  following   retirement  plan
distributions: (A) lump-sum or other distributions from a qualified corporate or
self-employed retirement plan following  retirement (or, in the  case of a  "key
employee"  of  a "top  heavy" plan,  following  attainment of  age 59  1/2); (B)
distributions from an IRA  or 403(b) Custodial  Account following attainment  of
age 59 1/2; or (C) a tax-free return of an excess contribution to an IRA; and
 
    (3)  all redemptions of  shares held for  the benefit of  a participant in a
corporate or self-employed retirement plan qualified under Section 401(k) of the
Internal  Revenue  Code  which  offers  investment  companies  managed  by   the
Investment  Manager or  its subsidiary,  Dean Witter  Services Company  Inc., as
self-directed investment alternatives and for  which Dean Witter Trust  Company,
an  affiliate  of  the Investment  Manager,  serves as  recordkeeper  or Trustee
("Eligible 401(k) Plan"), provided that either: (A) the plan continues to be  an
Eligible  401(k)  Plan  after  the  redemption;  or  (B)  the  redemption  is in
connection with the complete termination of the plan involving the  distribution
of all plan assets to participants.
 
    With  reference to (1) above, for the purpose of determining disability, the
Distributor utilizes the definition of disability contained in Section  72(m)(7)
of  the  Internal Revenue  Code, which  relates  to the  inability to  engage in
gainful employment. With reference  to (2) above,  the term "distribution"  does
not  encompass a direct transfer of  IRA, 403(b) Custodial Account or retirement
plan assets to  a successor custodian  or trustee. All  waivers will be  granted
only  following receipt by the Distributor  of confirmation of the shareholder's
entitlement.
 
REPURCHASE.  DWR and other Selected Broker-Dealers are authorized to  repurchase
shares  represented by a  share certificate which  is delivered to  any of their
offices. Shares held in a shareholder's account without a share certificate  may
also be repurchased by DWR and other Selected Broker-Dealers upon the telephonic
or telegraphic request of the shareholder. The repurchase price is the net asset
value  next computed (see "Purchase of Fund Shares") after such repurchase order
is received by DWR  or other Selected Broker-Dealer,  reduced by any  applicable
CDSC.
 
    The  CDSC, if  any, will  be the only  fee imposed  by either  the Fund, the
Distributor or DWR or other Selected  Broker-Dealer. The offer by DWR and  other
Selected  Broker-Dealers to repurchase shares may be suspended without notice by
the Distributor at any time. In that event, shareholders may redeem their shares
through the Fund's Transfer Agent as set forth above under "Redemption."
 
PAYMENT FOR SHARES REDEEMED  OR REPURCHASED.  Payment  for shares presented  for
repurchase  or redemption will be made by  check within seven days after receipt
by the Transfer Agent of the  certificate and/or written request in good  order.
Such payment may be postponed or the right of redemption suspended under unusual
circumstances;  e.g., when normal  trading is not  taking place on  the New York
Stock Exchange. If  the shares to  be redeemed have  recently been purchased  by
check,  payment of the redemption  proceeds may be delayed  for the minimum time
needed to verify that the check used  for investment has been honored (not  more
than  fifteen days from the time of receipt of the check by the Transfer Agent).
Shareholders
 
                                                                              17
<PAGE>
maintaining margin  accounts  with DWR  or  another Selected  Broker-Dealer  are
referred  to  their account  executive regarding  restrictions on  redemption of
shares of the Fund pledged in the margin account.
 
REINSTATEMENT PRIVILEGE.  A shareholder who  has had his or her shares  redeemed
or  repurchased and  has not  previously exercised  this reinstatement privilege
may, within  thirty  days  after  the date  of  the  redemption  or  repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares   of  the  Fund  at  their  net  asset  value  next  determined  after  a
reinstatement request, together with the  proceeds, is received by the  Transfer
Agent  and receive a pro-rata  credit for any CDSC  paid in connection with such
redemption or repurchase.
 
INVOLUNTARY REDEMPTION.  The Fund reserves  the right to redeem, on sixty  days'
notice  and at net asset value, the shares of any shareholder (other than shares
held in  an Individual  Retirement Account  or Custodial  Account under  Section
403(b)(7)  of the Internal Revenue Code) whose  shares due to redemptions by the
shareholder have a value of less than $100 or such lesser amount as may be fixed
by the Trustees or, in the case of an account opened through EasyInvest-SM-,  if
after  twelve  months  the shareholder  has  invested  less than  $1,000  in the
account. However, before the Fund redeems such shares and sends the proceeds  to
the  shareholder, it will notify the shareholder that the value of the shares is
less than the  applicable amount  and allow  him or her  sixty days  to make  an
additional  investment in an amount which will  increase the value of his or her
account to at least the applicable amount before the redemption is processed. No
CDSC will be imposed on any involuntary redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
DIVIDENDS AND  DISTRIBUTIONS.    The  Fund  intends  to  pay  dividends  and  to
distribute substantially all of its net investment income and distribute capital
gains,  if  any, once  each year.  The  Fund may,  however, determine  either to
distribute or to retain all or part  of any long-term capital gains in any  year
for reinvestment.
 
    All dividends and any capital gains distributions will be paid in additional
Fund  shares  and automatically  credited to  the shareholder's  account without
issuance of a share certificate unless the shareholder requests in writing  that
all   dividends  and/or  distributions   be  paid  in   cash  (see  "Shareholder
Services--Automatic Investment of Dividends and Distributions").
 
TAXES.  Because the Fund intends to distribute all of its net investment  income
and  net short-term  capital gains  to shareholders  and otherwise  qualify as a
regulated investment company under Subchapter M of the Internal Revenue Code, it
is not expected that the Fund will be required to pay any Federal income tax  on
any  such  income and  capital  gains. Shareholders  will  normally have  to pay
Federal income taxes, and any state and local income taxes, on the dividends and
distributions they receive from the Fund.
 
    Distributions of net investment income and net short-term capital gains  are
taxable to the shareholder as ordinary dividend income regardless of whether the
shareholder  receives such distributions  in additional shares  or in cash. Some
part of  such  dividends and  distributions  may  be eligible  for  the  Federal
dividends received deduction available to the Fund's corporate shareholders.
 
    Distributions  of  net  long-term  capital gains,  if  any,  are  taxable to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional shares or in cash. Capital  gains distributions are not eligible  for
the dividends received deduction.
 
    After  the  end  of  the  calendar  year,  shareholders  will  be  sent full
information on their dividends and capital gains distributions for tax purposes.
To avoid  being subject  to a  31%  Federal backup  withholding tax  on  taxable
dividends,  capital  gains distributions  and  the proceeds  of  redemptions and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to their accuracy.
 
    Dividends, interest  and  gains  received  by the  Fund  may  give  rise  to
withholding  and other taxes  imposed by foreign countries.  If it qualifies for
and makes the appropriate election with  the Internal Revenue Service, the  Fund
will  report annually to its shareholders the  amount per share of such taxes to
enable shareholders to  claim United  States foreign tax  credits or  deductions
with  respect to such taxes. In the absence  of such an election, the Fund would
deduct foreign tax in computing the amount of its distributable income.
 
    Shareholders should consult their  tax advisers as  to the applicability  of
the foregoing to their current situation.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
From  time to time the  Fund may quote its  "total return" in advertisements and
sales literature. The total return of  the Fund is based on historical  earnings
and is not intended to indicate future performance.
 
18
<PAGE>
    The  "average annual total return" of the Fund refers to a figure reflecting
the average annualized  percentage increase  (or decrease)  in the  value of  an
initial investment in the Fund of $1,000 over periods of one, five and ten years
or  over the life of the Fund if  less than any of the foregoing. Average annual
total return  reflects  all income  earned  by  the Fund,  any  appreciation  or
depreciation  of the Fund's  assets, all expenses  incurred by the  Fund and all
sales charges incurred by share-holders, for the stated periods. It also assumes
reinvestment of all dividends and distributions paid by the Fund.
 
    In addition to the foregoing, the  Fund may advertise its total return  over
different  periods of time  by means of aggregate,  average, and year-by-year or
other types of total return figures. The  Fund may also advertise the growth  of
hypothetical investments of $10,000, $50,000 and $100,000 in shares of the Fund.
Such  calculations  may  or may  not  reflect  the deduction  of  the contingent
deferred sales charge which, if reflected, would reduce the performance  quoted.
The  Fund  from time  to time  may  also advertise  its performance  relative to
certain performance rankings and indexes compiled by independent  organizations,
such as mutual fund performance rankings of Lipper Analytical Services, Inc.
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
VOTING  RIGHTS.  All shares of beneficial interest  of the Fund are of $0.01 par
value and are equal as to earnings,  assets and voting privileges. There are  no
conversion,  pre-emptive  or  other  subscription  rights.  In  the  event  of a
liquidation, each share of  beneficial interest of the  Fund is entitled to  its
portion  of all the Fund's  assets after all debts  and expenses have been paid.
The shares do not have cumulative voting rights.
 
    The Fund is  not required to  hold Annual Meetings  of Shareholders and,  in
ordinary  circumstances, the  Fund does  not intend  to hold  such meetings. The
Trustees may call  Special Meetings  of Shareholders for  action by  shareholder
vote  as may be required  by the Act or the  Declaration of Trust. Under certain
circumstances the Trustees may be  removed by action of  the Trustees or by  the
shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances,  be held  personally liable  as partners  for obligations  of the
Fund. However,  the  Declaration of  Trust  contains an  express  disclaimer  of
shareholder  liability for acts  or obligations of the  Fund, requires that Fund
obligations include  such  disclaimer,  and  provides  for  indemnification  and
reimbursement  of expenses out  of the Fund's property  for any shareholder held
personally liable  for  the  obligations  of  the Fund.  Thus,  the  risk  of  a
shareholder  incurring  financial loss  on account  of shareholder  liability is
limited to circumstances in which  the Fund itself would  be unable to meet  its
obligations.  Given the above limitations on shareholder personal liability, and
the nature of the Fund's assets and operations, in the opinion of  Massachusetts
counsel to the Fund, the risk to shareholders of personal liability is remote.
 
CODE  OF ETHICS.   Directors, officers and employees  of the Investment Manager,
Dean Witter Services Company  Inc. and the Distributor  are subject to a  strict
Code  of Ethics adopted  by those companies.  The Code of  Ethics is intended to
ensure that the interests of shareholders and other clients are placed ahead  of
any  personal  interest,  that no  undue  personal  benefit is  obtained  from a
person's employment  activities  and  that actual  and  potential  conflicts  of
interest  are  avoided.  To  achieve  these  goals  and  comply  with regulatory
requirements, the Code  of Ethics  requires, among other  things, that  personal
securities  transactions by employees of the  companies be subject to an advance
clearance process to monitor  that no Dean  Witter Fund is  engaged at the  same
time  in a purchase  or sale of the  same security. The Code  of Ethics bans the
purchase of  securities  in  an  initial public  offering,  and  also  prohibits
engaging in futures and options transactions and profiting on short-term trading
(that  is, a purchase within sixty days of a sale or a sale within sixty days of
a purchase) of a security. In addition, investment personnel may not purchase or
sell a security for  their personal account within  thirty days before or  after
any  transaction in any Dean Witter Fund  managed by them. Any violations of the
Code of  Ethics  are subject  to  sanctions, including  reprimand,  demotion  or
suspension  or  termination  of employment.  The  Code of  Ethics  comports with
regulatory requirements  and  the recommendations  in  the 1994  report  by  the
Investment Company Institute Advisory Group on Personal Investing.
 
    The  Fund's  Sub-Adviser  also has  a  Code  of Ethics  which  complies with
regulatory requirements and, insofar  as it relates  to persons associated  with
the  Fund, the 1994 report by the Investment Company Institute Advisory Group on
Personal Investing.
 
SHAREHOLDER INQUIRIES.  All inquiries regarding  the Fund should be directed  to
the  Fund at the  telephone numbers or address  set forth on  the front cover of
this Prospectus.
 
                                                                              19
<PAGE>
DEAN WITTER JAPAN FUND
REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE SHAREHOLDERS AND TRUSTEES
OF DEAN WITTER JAPAN FUND
 
In our opinion, the accompanying statement of assets and liabilities, including
the portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights (appearing on page 4 of this
Prospectus) present fairly, in all material respects, the financial position of
Dean Witter Japan Fund (the "Fund") at May 31, 1996, and the results of its
operations, the changes in its net assets and the financial highlights for the
period April 26, 1996 (commencement of operations) through May 31, 1996, in
conformity with generally accepted accounting principles. These financial
statements and financial highlights (hereafter referred to as "financial
statements") are the responsibility of the Fund's management; our responsibility
is to express an opinion on these financial statements based on our audit. We
conducted our audit of these financial statements in accordance with generally
accepted auditing standards which require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements, assessing
the accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audit, which included confirmation of securities at May 31, 1996 by
correspondence with the custodian and brokers and the application of alternative
auditing procedures where confirmations from brokers were not received, provides
a reasonable basis for the opinion expressed above.
 
PRICE WATERHOUSE LLP
1177 AVENUE OF THE AMERICAS
NEW YORK, NEW YORK 10036
JULY 10, 1996
 
  20
<PAGE>
DEAN WITTER JAPAN FUND
PORTFOLIO OF INVESTMENTS MAY 31, 1996
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             COMMON STOCKS (91.1%)
             AUTO PARTS - ORIGINAL EQUIPMENT (2.4%)
   297,000   Bridgestone Corp...................  $     5,164,262
   166,000   NOK................................        1,328,061
                                                  ---------------
                                                        6,492,323
                                                  ---------------
             AUTOMOBILES (4.0%)
   245,000   Mitsubishi Motors Corp.............        2,055,263
   250,000   Nissan Motor Co. Ltd...............        2,055,586
   530,000   Suzuki Motor Co. Ltd...............        6,715,686
                                                  ---------------
                                                       10,826,535
                                                  ---------------
             BANKING (12.0%)
   431,000   Asahi Bank, Ltd....................        5,182,205
   463,000   Bank of Tokyo - Mitsubishi Ltd.....       10,962,634
   155,000   Mitsubishi Trust & Banking.........        2,580,466
   265,000   Sanwa Bank, Ltd....................        5,098,039
   325,000   Sumitomo Bank......................        6,402,608
   185,000   Sumitomo Trust & Banking...........        2,566,593
                                                  ---------------
                                                       32,792,545
                                                  ---------------
             BUILDING & CONSTRUCTION (0.9%)
   158,000   National House Industrial..........        2,469,663
                                                  ---------------
             BUSINESS & PUBLIC SERVICES (1.6%)
    31,800   Asatsu Inc.........................        1,302,941
    49,000   Secom Co...........................        3,172,401
                                                  ---------------
                                                        4,475,342
                                                  ---------------
             CHEMICALS (4.0%)
   717,000   Asahi Chemical Industry Co. Ltd....        5,199,112
   286,000   Shin-Etsu Chemical Co..............        5,713,652
                                                  ---------------
                                                       10,912,764
                                                  ---------------
             ELECTRICAL EQUIPMENT (11.3%)
   169,000   Alpine Electronics Inc.............        3,126,156
   368,000   Canon, Inc.........................        7,215,686
   598,000   Hitachi, Ltd.......................        5,530,892
   471,000   Matsushita Electric Industrial Co.,
             Ltd................................        8,102,664
   153,000   Matsushita Electric Works..........        1,627,358
    85,600   Sony Corp..........................        5,439,068
                                                  ---------------
                                                       31,041,824
                                                  ---------------
             ELECTRONICS (10.0%)
   447,000   Furukawa Electric Co...............        2,629,412
    10,300   Keyence Corp.......................        1,352,756
    25,000   Kyocera Corp.......................        1,711,062
    43,700   Mabuchi Motor Co...................        2,708,010
    95,000   Murata Manufacturing Co., Ltd......        3,479,467
   362,000   NGK Insulators.....................        4,017,758
   223,000   Omron Corp.........................        4,516,926
    86,000   Rohm Co., Ltd......................        5,376,989
   117,000   Sumitomo Electric Industries.......        1,590,733
                                                  ---------------
                                                       27,383,113
                                                  ---------------
             ENGINEERING & CONSTRUCTION (2.9%)
   367,000   Kajima Corp........................        3,835,646
   196,000   Kandenko Co., Ltd..................        2,465,409
   100,000   Kinden Corp........................        1,581,576
                                                  ---------------
                                                        7,882,631
                                                  ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             FINANCIAL SERVICES (5.5%)
    27,000   Japan Associated Finance...........  $     3,121,532
   300,000   New Japan Securities (ADR).........        1,895,117
   364,000   Nomura Securities Co. Ltd..........        6,867,925
    63,000   Promise Co., Ltd...................        3,175,638
                                                  ---------------
                                                       15,060,212
                                                  ---------------
             INSURANCE (2.8%)
   428,000   Sumitomo Marine & Fire.............        3,871,476
   294,000   Tokio Marine & Fire Insurance
             Co.................................        3,806,881
                                                  ---------------
                                                        7,678,357
                                                  ---------------
             INTERNATIONAL TRADE (2.9%)
   581,000   Mitsubishi Corp....................        7,953,015
                                                  ---------------
             MACHINERY (7.2%)
   193,000   Asahi Diamond Industries Co.
             Ltd................................        2,481,225
    59,000   Fuji Machine Manufacturing Co......        1,571,587
 1,038,000   Kawasaki Heavy Industries..........        5,424,251
   599,000   Mitsubishi Heavy Industries,
             Ltd................................        5,146,791
   669,000   NSK Ltd............................        5,061,432
                                                  ---------------
                                                       19,685,286
                                                  ---------------
             MEDICAL PRODUCTS & SUPPLIES (0.6%)
   171,000   Olympus Optical Co. Ltd............        1,755,549
                                                  ---------------
             METALS (1.6%)
   730,000   Mitsubishi Materials Corp..........        4,253,607
                                                  ---------------
             PHARMACEUTICALS (2.1%)
   200,000   Banyu Pharmaceutical Co. Ltd.......        2,571,217
   137,000   Sankyo Co. Ltd.....................        3,243,803
                                                  ---------------
                                                        5,815,020
                                                  ---------------
             REAL ESTATE (2.4%)
   196,000   Mitsubishi Estate Co. Ltd..........        2,737,329
   308,000   Mitsui Fudosan Co..................        3,902,701
                                                  ---------------
                                                        6,640,030
                                                  ---------------
             RECREATION (1.0%)
    25,000   H.I.S. Company Ltd.................        1,405,845
    25,900   Sony Music Entertainment Inc.......        1,305,540
                                                  ---------------
                                                        2,711,385
                                                  ---------------
             RETAIL (2.4%)
    27,600   FamilyMart.........................        1,261,043
    46,000   Ito-Yokado Co. Ltd.................        2,608,028
   153,000   Tokyo Style........................        2,702,830
                                                  ---------------
                                                        6,571,901
                                                  ---------------
             RETAIL - DEPARTMENT STORES (0.4%)
    89,000   Isetan.............................        1,210,044
                                                  ---------------
             RETAIL - FOOD CHAINS (0.5%)
    34,000   York-Benimaru......................        1,386,792
                                                  ---------------
             RETAIL - SPECIALTY (0.5%)
    91,000   Best Denki Co. Ltd.................        1,245,653
                                                  ---------------
             STEEL & IRON (3.4%)
   856,000   Kobe Steel Ltd.....................        2,359,304
 1,701,000   NKK Corp...........................        4,971,476
   171,000   Yamato Kogyo Co., Ltd..............        1,866,260
                                                  ---------------
                                                        9,197,040
                                                  ---------------
</TABLE>
 
                        SEE NOTES TO FINANCIAL STATEMENTS
                                                                              21
<PAGE>
DEAN WITTER JAPAN FUND
PORTFOLIO OF INVESTMENTS MAY 31, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             TELECOMMUNICATIONS (2.4%)
       742   DDI Corp...........................  $     6,423,529
                                                  ---------------
             TEXTILES (0.9%)
   495,000   Teijin Ltd.........................        2,559,240
                                                  ---------------
             TRANSPORTATION (4.2%)
   158,000   Mitsubishi Warehouse & Transport...        2,761,931
   747,000   Nippon Yusen Kabushiki Kaish.......        4,380,300
   669,000   Tobu Railway Co. Ltd...............        4,337,486
                                                  ---------------
                                                       11,479,717
                                                  ---------------
             UTILITIES - GAS (1.2%)
   838,000   Osaka Gas Co.......................        3,263,023
                                                  ---------------
 
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $258,536,983).....      249,166,140
                                                  ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                             VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             SHORT-TERM INVESTMENT (a) (8.7%)
             U.S. GOVERNMENT AGENCY
 $  23,800   Federal Home Loan Mortgage Corp.
             5.30% due 06/03/96 (Amortized Cost
             $23,792,992).......................       23,792,992
                                                  ---------------
 
TOTAL INVESTMENTS
(IDENTIFIED COST $282,329,975) (B).....       99.8%   272,959,132
 
CASH AND OTHER ASSETS IN EXCESS OF
LIABILITIES............................        0.2        585,116
                                             -----   ------------
 
NET ASSETS.............................      100.0%  $273,544,248
                                             -----   ------------
                                             -----   ------------
 
<FN>
- ---------------------
ADR  American Depository Receipt.
(a)  Security was purchased on a discount basis. The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation was $1,494,512 and the
     aggregate gross unrealized depreciation was $10,865,355, resulting in net
     unrealized depreciation of $9,370,843.
</TABLE>
 
FORWARD FOREIGN CURRENCY CONTRACTS OPEN AT MAY 31, 1996:
 
<TABLE>
<CAPTION>
CONTRACTS TO       IN       DELIVERY     UNREALIZED
  DELIVER     EXCHANGE FOR    DATE      APPRECIATION
- -------------------------------------------------------
<S>           <C>           <C>       <C>
$5,288,414    Y 575,432,356 06/03/96      $ 33,750
$  693,818    Y  75,112,730 06/04/96           898
                                           -------
       Total unrealized
  appreciation......................      $ 34,648
                                           -------
                                           -------
</TABLE>
 
                        SEE NOTES TO FINANCIAL STATEMENTS
  22
<PAGE>
DEAN WITTER JAPAN FUND
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
MAY 31, 1996
 
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $282,329,975)............................  $272,959,132
Cash........................................................        10,983
Unrealized appreciation on open forward foreign currency
  contracts.................................................        34,648
Receivable for:
    Shares of beneficial interest sold......................     1,993,311
    Dividends...............................................         7,518
Deferred organizational expenses............................       203,422
                                                              ------------
     TOTAL ASSETS...........................................   275,209,014
                                                              ------------
LIABILITIES:
Payable for:
    Investments purchased...................................       683,629
    Plan of distribution fee................................       221,890
    Investment management fee...............................       221,890
    Shares of beneficial interest repurchased...............       127,142
Organizational expenses.....................................       207,375
Accrued expenses and other payables.........................       202,840
                                                              ------------
     TOTAL LIABILITIES......................................     1,664,766
                                                              ------------
NET ASSETS:
Paid-in-capital.............................................   283,665,100
Net unrealized depreciation.................................    (9,315,376)
Net realized loss...........................................      (805,476)
                                                              ------------
     NET ASSETS.............................................  $273,544,248
                                                              ------------
                                                              ------------
NET ASSET VALUE PER SHARE,
  28,455,288 SHARES OUTSTANDING (UNLIMITED SHARES AUTHORIZED
  OF $.01 PAR VALUE)........................................
                                                                     $9.61
                                                              ------------
                                                              ------------
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE PERIOD APRIL 26, 1996* THROUGH MAY 31, 1996
 
<TABLE>
<S>                                                           <C>
NET INVESTMENT INCOME:
INCOME
Interest....................................................  $    573,809
Dividends (net of $1,329 foreign withholding tax)...........         7,533
                                                              ------------
     TOTAL INCOME...........................................       581,342
                                                              ------------
EXPENSES
Plan of distribution fee....................................       249,726
Investment management fee...................................       249,726
Registration fees...........................................        97,626
Transfer agent fees and expenses............................        52,767
Professional fees...........................................        28,734
Custodian fees..............................................        17,753
Shareholder reports and notices.............................         8,650
Organizational expenses.....................................         4,089
Trustees' fees and expenses.................................         1,500
Other.......................................................           491
                                                              ------------
     TOTAL EXPENSES.........................................       711,062
                                                              ------------
     NET INVESTMENT LOSS....................................      (129,720)
                                                              ------------
NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized loss on foreign exchange transactions..........      (805,476)
                                                              ------------
Net unrealized appreciation/depreciation on:
    Investments.............................................    (9,370,843)
    Translation of forward foreign currency contracts, other
      assets and liabilities denominated in foreign
      currencies............................................        55,467
                                                              ------------
     TOTAL DEPRECIATION.....................................    (9,315,376)
                                                              ------------
NET DECREASE................................................  $(10,250,572)
                                                              ------------
                                                              ------------
<FN>
- ---------------------
* Commencement of operations.
</TABLE>
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                                FOR THE
                                                                 PERIOD
                                                               APRIL 26,
                                                                 1996*
                                                                THROUGH
                                                              MAY 31, 1996
- --------------------------------------------------------------------------
<S>                                                           <C>
INCREASE (DECREASE) IN NET ASSETS:
OPERATIONS:
Net investment loss.........................................  $   (129,720)
Net realized loss...........................................      (805,476)
Net unrealized depreciation.................................    (9,315,376)
                                                              ------------
     NET DECREASE...........................................   (10,250,572)
Net increase from transactions in shares of beneficial
  interest..................................................   283,694,820
                                                              ------------
     TOTAL INCREASE.........................................   273,444,248
NET ASSETS:
Beginning of period.........................................       100,000
                                                              ------------
     END OF PERIOD..........................................  $273,544,248
                                                              ------------
                                                              ------------
<FN>
- ---------------------
* Commencement of operations.
</TABLE>
 
                        SEE NOTES TO FINANCIAL STATEMENTS
                                                                              23
<PAGE>
DEAN WITTER JAPAN FUND
NOTES TO FINANCIAL STATEMENTS MAY 31, 1996
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter Japan Fund (the "Fund") is registered under the Investment Company
Act of 1940, as amended (the "Act"), as a non-diversified, open-end management
investment company. The Fund's investment objective is to seek long-term capital
appreciation. The Fund seeks to meet its investment objective by investing
primarily in securities of issuers located in Japan. The Fund was organized as a
Massachusetts business trust on January 22, 1996 and had no operations other
than those relating to organizational matters and the issuance of 10,000 shares
of beneficial interest for $100,000 to Dean Witter InterCapital Inc. (the
"Investment Manager") to effect the Fund's initial capitalization. The Fund
commenced operations on April 26, 1996.
 
The preparation of financial statements in accordance with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts and disclosures. Actual results could differ from
those estimates. The following is a summary of significant accounting policies:
 
A. VALUATION OF INVESTMENTS -- (1) an equity security listed or traded on the
New York, American or other domestic or foreign stock exchange is valued at its
latest sale price on that exchange prior to the time when assets are valued; if
there were no sales that day, the security is valued at the latest bid price (in
cases where securities are traded on more than one exchange; the securities are
valued on the exchange designated as the primary market by the Trustees); (2)
all other portfolio securities for which over-the-counter market quotations are
readily available are valued at the latest available bid price prior to the time
of valuation; (3) when market quotations are not readily available, including
circumstances under which it is determined by the Investment Manager that sale
or bid prices are not reflective of a security's market value, portfolio
securities are valued at their fair value as determined in good faith under
procedures established by and under the general supervision of the Trustees; (4)
certain portfolio securities may be valued by an outside pricing service
approved by the Trustees. The pricing service may utilize a matrix system
incorporating security quality, maturity and coupon as the evaluation model
parameters, and/or research and evaluations by its staff, including review of
broker-dealer market price quotations, if available, in determining what it
believes is the fair valuation of the securities valued by such pricing service;
and (5) short-term debt securities having a maturity date of more than sixty
days at time of purchase are valued on a mark-to-market basis until sixty days
prior to maturity and thereafter at amortized cost based on their value on the
61st day. Short-term debt securities having a maturity date of sixty days or
less at the time of purchase are valued at amortized cost.
 
B. ACCOUNTING FOR INVESTMENTS -- Security transactions are accounted for on the
trade date (date the order to buy or sell is executed). Realized gains and
losses on security transactions are determined by the identified cost method.
Dividend income and other distributions are recorded on the ex-dividend date
except for certain dividends on foreign securities which are recorded as soon as
the Fund is informed after the ex-dividend date. Discounts are accreted over the
life of the respective securities. Interest income is accrued daily.
 
C. FOREIGN CURRENCY TRANSLATION -- The books and records of the Fund are
maintained in U.S. dollars as follows: (1) the foreign currency market value of
investment securities, other assets and liabilities and forward contracts are
translated at the exchange rates prevailing at the end of the period; and (2)
purchases, sales, income and expenses are translated at the exchange rates
prevailing on the
 
  24
<PAGE>
DEAN WITTER JAPAN FUND
NOTES TO FINANCIAL STATEMENTS MAY 31, 1996, CONTINUED
 
respective dates of such transactions. The resultant exchange gains and losses
are included in the Statement of Operations as realized and unrealized gain/loss
on foreign exchange transactions. Pursuant to U.S. Federal income tax
regulations, certain foreign exchange gains/losses included in realized and
unrealized gain/loss are included in or are a reduction of ordinary income for
federal income tax purposes. The Fund does not isolate that portion of the
results of operations arising as a result of changes in the foreign exchange
rates from the changes in the market prices of the securities.
 
D. FORWARD FOREIGN CURRENCY CONTRACTS -- The Fund may enter into forward foreign
currency contracts which are valued daily at the appropriate exchange rates. The
resultant unrealized exchange gains and losses are included in the Statement of
Operations as unrealized foreign currency gain or loss and in the Statement of
Assets and Liabilities as part of the related foreign currency denominated asset
or liability. The Fund records realized gains or losses on delivery of the
currency or at the time the forward contract is extinguished (compensated) by
entering into a closing transaction prior to delivery.
 
E. FEDERAL INCOME TAX STATUS -- It is the Fund's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated investment
companies and to distribute all of its taxable income to its shareholders.
Accordingly, no federal income tax provision is required.
 
F. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Fund records dividends and
distributions to its shareholders on the ex-dividend date. The amount of
dividends and distributions from net investment income and net realized capital
gains are determined in accordance with federal income tax regulations which may
differ from generally accepted accounting principles. These "book/tax"
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature, such amounts are reclassified
within the capital accounts based on their federal tax-basis treatment;
temporary differences do not require reclassification. Dividends and
distributions which exceed net investment income and net realized capital gains
for financial reporting purposes but not for tax purposes are reported as
dividends in excess of net investment income or distributions in excess of net
realized capital gains. To the extent they exceed net investment income and net
realized capital gains for tax purposes, they are reported as distributions of
paid-in-capital.
 
G. ORGANIZATIONAL EXPENSES -- The Investment Manager paid the organizational
expenses of the Fund in the amount of approximately $207,000 and will be
reimbursed for the full amount thereof. Such expenses have been deferred and are
being amortized on the straight-line method over a period not to exceed five
years from the commencement of operations.
 
2. INVESTMENT MANAGEMENT AND SUB-ADVISORY AGREEMENTS
 
Pursuant to an Investment Management Agreement, the Fund pays the Investment
Manager a management fee, calculated daily and payable monthly, by applying the
annual rate of 1.0% to the net assets of the Fund determined as of the close of
each business day.
 
Under the terms of the Agreement, in addition to managing the Fund's
investments, the Investment Manager maintains certain of the Fund's books and
records and furnishes, at its own expense, office space, facilities, equipment,
clerical, bookkeeping and certain legal services and pays the salaries of all
personnel, including officers of the Fund who are employees of the Investment
Manager. The
 
                                                                              25
<PAGE>
DEAN WITTER JAPAN FUND
NOTES TO FINANCIAL STATEMENTS MAY 31, 1996, CONTINUED
 
Investment Manager also bears the cost of telephone services, heat, light, power
and other utilities provided to the Fund.
 
Under a Sub-Advisory Agreement between Morgan Grenfell Investment Services Ltd.
("Morgan Grenfell" or the "Sub-Adviser") and the Investment Manager, the
Sub-Adviser provides the Fund with investment advice and portfolio management
relating to the Fund's investments in securities, subject to the overall
supervision of the Investment Manager. As compensation for the services provided
pursuant to the Sub-Advisory Agreement, the Investment Manager pays the
Sub-Adviser monthly compensation equal to 40% of its monthly compensation.
 
3. PLAN OF DISTRIBUTION
 
Shares of the Fund are distributed by Dean Witter Distributors Inc. (the
"Distributor"), an affiliate of the Investment Manager. The Fund has adopted a
Plan of Distribution (the "Plan") pursuant to Rule 12b-1 under the Act pursuant
to which the Fund pays the Distributor compensation, accrued daily and payable
monthly, at an annual rate of 1.0% of the lesser of: (a) the average daily
aggregate gross sales of the Fund's shares since the Fund's inception (not
including reinvestment of dividend or capital gain distributions) less the
average daily aggregate net asset value of the Fund's shares redeemed since the
Fund's inception upon which a contingent deferred sales charge has been imposed
or upon which such charge has been waived; or (b) the Fund's average daily net
assets. Amounts paid under the Plan are paid to the Distributor to compensate it
for the services provided and the expenses borne by it and others in the
distribution of the Fund's shares, including the payment of commissions for
sales of the Fund's shares and incentive compensation to, and expenses of, the
account executives of Dean Witter Reynolds Inc. ("DWR"), an affiliate of the
Investment Manager and Distributor, and other employees or selected
broker-dealers who engage in or support distribution of the Fund's shares or who
service shareholder accounts, including overhead and telephone expenses,
printing and distribution of prospectuses and reports used in connection with
the offering of the Fund's shares to other than current shareholders and
preparation, printing and distribution of sales literature and advertising
materials. In addition, the Distributor may be compensated under the Plan for
its opportunity costs in advancing such amounts which compensation would be in
the form of a carrying charge on any unreimbursed expenses incurred by the
Distributor.
 
Provided that the Plan continues in effect, any cumulative expenses incurred but
not yet recovered by the Distributor, may be recovered through future
distribution fees from the Fund and contingent deferred sales charges from the
Fund's shareholders.
 
The Distributor has informed the Fund that for the period ended May 31, 1996, it
received approximately $8,000 in contingent deferred sales charges from
redemptions of the Fund's shares.
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
The cost of purchases of portfolio securities, excluding short-term investments,
for the period ended May 31, 1996 aggregated $258,536,983.
 
Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At May 31, 1996, the Fund had
transfer agent fees and expenses payable of approximately $53,000.
 
  26
<PAGE>
DEAN WITTER JAPAN FUND
NOTES TO FINANCIAL STATEMENTS MAY 31, 1996, CONTINUED
 
5. SHARES OF BENEFICIAL INTEREST
 
Transactions in shares of beneficial interest were as follows:
 
<TABLE>
<CAPTION>
                                                                          FOR THE PERIOD
                                                                         APRIL 26, 1996*
                                                                       THROUGH MAY 31, 1996
                                                                   ----------------------------
                                                                     SHARES          AMOUNT
                                                                   -----------   --------------
<S>                                                                <C>           <C>
Sold.............................................................   28,633,915   $  285,529,384
Repurchased......................................................     (188,627)      (1,834,564)
                                                                   -----------   --------------
Net increase.....................................................   28,445,288   $  283,694,820
                                                                   -----------   --------------
                                                                   -----------   --------------
<FN>
 
- ---------------------
*    Commencement of operations.
</TABLE>
 
6. FEDERAL INCOME TAX STATUS
 
Foreign currency losses incurred after October 31 ("post-October losses") within
the taxable year are deemed to arise on the first business day of the Fund's
next taxable year. The Fund incurred and will elect to defer net foreign
currency losses of approximately $771,000 during fiscal 1996. As of May 31,
1996, the Fund had temporary book/tax differences primarily attributable to
post-October losses and permanent book/tax differences primarily attributable to
a net operating loss. To reflect reclassifications arising from permanent
book/tax differences for the period ended May 31, 1996, paid-in-capital was
charged and net investment loss was credited $129,720.
 
7. PURPOSES OF AND RISKS RELATING TO CERTAIN FINANCIAL INSTRUMENTS
 
The Fund may enter into forward foreign currency contracts ("forward contracts")
to facilitate settlement of foreign currency denominated portfolio transactions
or to manage foreign currency exposure associated with foreign currency
denominated securities.
 
At May 31, 1996, there were outstanding forward contracts used to facilitate
settlement of foreign currency denominated portfolio transactions.
 
Forward contracts involve elements of market risk in excess of the amounts
reflected in the Statement of Assets and Liabilities. The Fund bears the risk of
an unfavorable change in the foreign exchange rates underlying the forward
contracts. Risks may also arise upon entering into these contracts from the
potential inability of the counterparties to meet the terms of their contracts.
 
8. SELECTED PER SHARE DATA AND RATIOS
 
See the "Financial Highlights" table on page 4 of this Prospectus.
 
                                                                              27
<PAGE>
 
DEAN WITTER
JAPAN FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
(212) 392-2550
 
TRUSTEES
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Sheldon Curtis
Vice President, Secretary and
General Counsel
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Chase Manhattan Bank N.A.
One Chase Plaza
New York, NY 10005
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
Dean Witter InterCapital Inc.
 
SUB-ADVISER
Morgan Grenfell Investment Services
Limited


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