Is it possible to become a permanent resident or citizen of Japan… by a means OTHER than marriage?
I think that the best thing to become a permanent residence is to marry a Japanese. If you have a Japanese parent but have a different passport, you can also become a permanent resident. I am living and working in Japan on a work visa and life is pretty good. If you can get a job, then it isn’t a big inconvenience to renew your work visa every so often. It is quite easy actually. Good luck.