In your own country you are probably used to using plastic. However, be prepared as Japan is a cash culture and the cash is Yen.

You will hardly ever see someone using a credit card and ATM machines are not easy to find.  Not to mention ATM machine hours depend on the individual bank and most are only open from 8am to 10pm with limited hours for Sundays and public holidays.  So it is wise to check in advance and know what hours your bank and their cash machines are open so you do not get stuck without money.  Banks do not charge a fee for deposits or withdrawals within business hours. However, there is a 105 yen fee if you use these services outside business hours.