Recommendations for Japanese tax advisor/lawyer regarding transferring brokerage / securities

My bank in my home country (in Europe) just canceled my brokerage account (probably because I moved to Japan), which means I might have to open up a brokerage account in Japan and transfer my securities there.

I'd like to talk to a tax advisor or tax lawyer before, to avoid making any costly mistakes.

Did anyone go through something similar and have a recommendation on who to talk to in my situation?

I live in Tokyo, but I'd be okay with advisors from any location if video calls are available.

by goddammitbutters