Overseas payment of extension of Japanese study visa

You said before that I don't know your visa time, so I'll tell you what I know;

First, money sent overseas must be transferred to your Japanese bank through the bank in China. Bank cards transferred to China are not recognized, because you need to provide proof of the money sent by the Japanese bank. It is certain that Japan only recognizes the information of its own domestic banks. As for your statement that Japanese banks will not accept overseas remittances within six months, I have never heard of it in Japan 10 for more than years. At least Mitsubishi didn't. As for how much money to send, the more the better, because you came to Japan to study, not to work, and it is the last word to give you money at home to spend in Japan. This is also the reason why international students have limited working hours.