I moved to Japan
Welcome back Bex.
Sounds awesome what you're doing in Japan.
I teach English on the JET Programme. Depending on where you get placed, it's not expensive at all. I live in the middle of the countryside so I don't pay much rent and have it pretty good. You get paid well enough to save and travel. Also it depends which path you take to teach English, I hear some people have it pretty bad with the big eikaiwa companies.