Finding an ATM that will accept your international card is hard if you don't know where to go. The Japanese system for using ATM's isn't the same as abroad and you don't want to be caught without any cash in Japan. There are two ways to have access to your ATM,

Post Office ATM
Citibank
Shinsei Bank

The easiest ATM to find that will accept your international ATM card is the Post Office Bank ATM.

In Japan, the Post Office is also a bank where you can have a saving account, send money to other accounts, send international remittances, exchange currency, and other banking services.

In 2001, the Post Office Bank, Yucho changed it's ATM's to accept international cards. Post office banks are located all over Japan. Beware that most ATM's in Japan are not open 24 hours a day.

	Using Affiliated Banking Facilities' Service ATM and CD with Postal Banking Card ATM・CD of affiliated banking facilities between JAPAN POST with Postal Banking Card, the customers can transact with ordinary postal saving, that of deposit, withdrawal and outstanding balance inquires. Further, the mark at right is indicated on the ATMs and CDs of Yucho that accept cash cards of affiliated banking facilities.
	Postal Banking Services with Affiliated Banking Facilities' Card on ATM・CD ATM・CD of postal banking all over Japan with affiliated banking facilities card etc.,the customers can transact with deposit, payment, cashing, outstanding balance inquires and cashing inquires etc.
	Using ATMs of Yucho with cash cards issued outside Japan Payments and cashing can be done in ATMs of Yucho all over Japan using the following cash cards issued abroad. Type of card Issued financial organizations Credit card VISA International MasterCard International American Express Diners Club JCB Debit card Financial organizations participating in VISA Electron and Maestro Networks Cash Card Financial organizations participating in PLUS and CIRRUS Networks
	The Operating Hours Handle Charge （including consumption tax） Weekday 8：45〜18：00 Saturday 9：00〜14：00 105 Yen Besides above mentioned days 210 Yen

Yucho - Post office bank homepage with information regarding ATM use.

Other than Yu-Cho, you may find Citibank branches that accept International cards. However, there are not many Citibank branches and they are only found in large cities like Tokyo, Yokohama and Kyoto.

Citibank - Find out branch locations and more info regarding ATM's in Japan here.

Shinsei Bank announced that it has installed ATMs that accept bank cards and credit cards issued by foreign institutions participating in the international VISA and PLUS networks.

The new ATMs were installed in seven locations, including five inside the Roppongi Hills complex. The bank said it plans to install more in high-demand areas such as airports and business districts. Despite both domestic and international calls for change, most Japanese ATMS, with the exception of those of the postal service and a handful of financial institutions, are still incompatible with bank cards and credit cards issued overseas.

Shinsei Bank - Find out branch locations and more info regarding ATM's in Japan here.