On the visa operation of Japanese job-hopping

It depends on what contract your friend signed with this company before coming to Japan ~ If the contract stipulates that you can't resign within a certain period of time, you can't ~ If you can ~ You should ask your friend to ask the company where you work to issue a resignation certificate ~ If the company doesn't want to, you can go to a lawyer for legal channels ~ Remember that the company where you work must issue a resignation certificate and a tax bill ~ If you don't have these documents, it will seriously affect the visa renewal next year ~