You don't need a company to sponsor you for a bank account in Japan either, but if you just moved into the country, they do want to know who your employer is.

You don't need a company to sponsor you for a bank account in Japan either, but if you just moved into the country, they do want to know who your employer is. Same for landlords: why would anyone rent you an apartment if you don't have an income? Where did you get the idea that you need your company to help you set up a bank account? I was able to do it easily at 2 banks all by myself.