I hear the best way to get Japanese citisenship for an American is to Teach English, how do you go about it?

What I mean is what are the Job requirements to being an English instructor in Japan. What do they expect you to teach, because our English cles are not like our foreign language cles, so is Japan the same or do they use the same style English cles we have. In other words is it teaching to read, write, and speak well enough to understand a foreigner, or is it teaching the nitty gritty stuff that a novelist would want to know?