The first method is to go to the bank to print the details. If a person is abroad and there is no foreign bank with your card, you can send the card back to your parents, so that they can print it and send it back to you. It's a little troublesome, but it can be proved after all.

The second way is for you to get a Japanese card and ask your parents to send you some money. There is not much money, which can prove it.