What kind of “money” to use? Now ATM (cash cards, debit cards) can be readily used at Seven Eleven or other convenience stores (mini mart) which are more prevalent than all banks and post offices put together, on almost every other corner in large cities.

Citi bank has left Japan.

Prepaid cards are now very prevalent and if you have a smartphone specifically for the Japanese market they can save those cards in an app and you can swipe the smartphone to pay.

Banking in Japan.