Creatives working in Japan, can you share me your experience?

I'm currently 23 and have at least 2 years working in a marketing and publishing industry. I wanted to know what should I expect when looking for jobs (most especially publishing-magazines specifically) as a creative in Japan as I have been really keen on working there anytime soon.

What I know so far is that I need to have a strong portfolio (but what do they really check in these? Like what specifically so I can focus on those) and having at least N2 or N1 level of Nihongo.

If you have other things in mind, please let me know.

by Electronic_Sir_8136