ID jobs in Japan

i’ve been to Japan a few times and the more i go, the more i wanna live there. I’d rather find some work in the ID field than to go and teach english just so that I can live there, but I have no idea about the design scene there or how to go about it. I’ve been told by some people that there is a big design scene in Aoyama, Tokyo, of American and European designers who are living in small design communities where they share living and working space and do work for japanese companies. I’ve also heard that this is very illegal. Is there anyone out there who is/has worked in Japan and can help me with any advice?