I wanna say as a Japanese, this is not a place to work as an English teacher. I totally agree with Joe. Plus, you can't teach as you want.
Just follow the rules, do as written in textbooks, that's it. Nothing fun, nothing attainable. Schools con people into studying there, teach nothing, and make them pay more. Hence, nobody can use English, but everyone has lots of excuses why they can't, like English is just a communication tool...whoa, it's the most important thing in our life!!!
Anyway, don't think of teaching here, or you'll be bummed.