ATM in Japan

There are many ATMs around Japan, you can find one at every bank and even at convenient shop such as 7Eleven or Family Mart. But you must consider that not all the ATM’s accept credit card issued outside of Japan, especially those in the convenient shops.

Many ATM's that are located in the banks, operate only during banking hours, and this means that you can be stuck without any cash during the weekend.

You can also withdraw money in a post office - you will see a sticker that indicates that following cards are accepted.
Postal services information in English you can find on this site: http://www.post.japanpost.jp/english/news/number_info.htm

Also you can always withdraw money at CitiBank ATM's (see branches) using your foreign credit card .