Hey ya! Have you ever come across this type of document where you have to state that ~~ company (that you are about to start working for) is not your primary source of income?
Part time job. It’s the first time I’ve come across with this wording. Also I am by no means an expert regarding jobs in Japan. Thanks in advance!
https://www.reddit.com/r/japan/comments/126nd6h/letter_of_notice_of_nonprimary_income/