RE: Anyone here ever lived in Japan?
Did you ask this the other week mate? Just there was an identical thread a few weeks back?
Anyway I've never been to Japan but a good mate of mine is over there now. He's doing what you plan on doing, he teaches. He teaches kids English. The money is really good, even though he doesn't speak Japanese very well.
He's been there about a year now I guess. He really likes it. I think he mostly likes the attention from the Japanse women lol. From what he says, he seems to be having one of the best times of his life over there. I don't think he's planning on coming back!