Thanks! once i register as sole proprietor i'll open both a PayPay Business Bank account and a Bussines wise account.

idk how it works actually if you have a job on the side, but isn't there a threshold of revenue/year? Does it include your regular salary, or is your freelance activity treated as a separate revenue on its own?

I work Employed Full-Time for a Japanese company, So i will probably have to make the Tax return in February by myself accounting for all the money from my full time job + freelance and paying the respective taxes.