Want to diversify nasdaq based stock

Hi folks, currently I am working outside of Japan and has been granted a nasdaq listed company’s stock in Morgan stanley brokerage. What I want to do is simply sell it and buy ETF within the same brokerage account to diversify.

Question is given on following months I’ll start relocate to jpn and receiving my salary in JPY, and I am planning to do this transaction after working in Japan, will this action incur sales tax in Japan tax law? Is it safe to do? Or is it better to sell it all in my home country and just remit to Japan in cash via foreign bank transfer?

Thanks before, sorry if this has been asked before

by Purpose_Acceptable