Maybe you could look for a position teaching, although it's easier for English speakers that's how i went.

I suggest you might want to learn some Japanese University or work company. I'm not sure, but I think some company looking for foreighners who speak English and thire mother tongue.　http://staff.tsubasainc.net/navi-kyujin.html　← This web site is collected the contents of the job advertisement. I saw some job advertisement in thieweb site, you need Business Japanese level. But I think it is worth working to watch this web site. If you have more quwtions, welcome ask to me! 

First of all: don´t see it as a dream, proposed as a target!!

by the way, I have the same target. Japan is a marvelous country!!