You know what Ghost? I got advice for you now. More advice.
If you are really serious about moving to Japan, first, be a little more realistic with your plan. So far, it doesnt sound to me that you have any idea of what you are doing, or getting into. You seem to be fueled merely by a fantasy of what Japan life may be, or give you.
But anyway, if you really want to live there, join a band. I'm dead serious. I say this because the band I play with, has been my ticket to Japan 3 years and counting.
Because of the contacts *yeah, contacts, you better find some if you plan to stand a chance surviving in the country without speaking the language* that I was able to easily fly and live there. It was because of the contacts that I have a few places to stay for free, for when I go back this year. Its because of the contacts through the band that I even got the chance to do it in the first place.
So pick yourself up an instrument, start talking to a lot of people overseas, form a band, and book dates to play in venues overseas. At least, thats how its worked for me.