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Airports and currency exchange stores often offer low exchange rates for changing your money into a foreign currency. To get the best exchange rate, you should use your ATM card to withdraw money while in Japan.
Not all ATMs in Japan accept foreign ATM cards. However, it is easy to find a Citibank ATM or a post office ATM. Both of these will accept foreign ATM cards and offer services in English. The symbol for the post office in Japan is a red T with an extra line on top.
As your bank will probably charge a small fee for the use of a foreign ATM machine, you should withdraw the maximum amount.