It is so convenient that you can easily spot ATMs in Japan. It could not only be in a bank or post office, but also in a convenience store or shopping mall around you. Most ATMs have English user menu on the screen and accept major bankcards and international cards like Citibank. In addition, you can withdraw cash by credit cards, such as Visa and MasterCard with limited withdrawal amount per transaction. So, it might be easier than bringing cash over to Japan!