Characteristics of Bank Account in Japan. (in General)

• Free of Charge, even though you have a small amount of money.
• Deposit is protected by law until 10,000,000 yen, (100,000USD roughly), in case of bankrupt of a bank.
• Economy is quite stable. It is the safest country to keep your money.
• Almost zero interest. (do not think to get an interest.)

Some specific bank has a function in which you can withdraw money overseas. So that you can save money in the country, you can use your money as you wish.

• SMTB (Mitsui-Sumitomo Trust Bank) (ex-Citibank).
0 yen commission if you have 1,000,000 yen (roughly 10,000 USD) or more. Note additional 3% exchange rate, because you withdraw money in a local currency.

Also it might be a good idea to make a credit card linked to the account.