Its surprisingly easy to get gigs in Japan. Its true, you'll come up with harsher criticism in the states, than you will in the Big-J.
I'm in a vk band, and all of us are Asian, but none of us a Japanese. Nobody can tell the difference though.
Some words of advice though; understand the rules of music, before you do anything. The rules of music and the biz dont bias on genre or ethnicity; so familiarize yourself with the 'game'.