Living in Japan you should have no problem finding a Kyosho Calamato trainer. They are really good trainers.
After that I would suggest that you buy a proper kit to learn how to build your own aircraft. Aircraft that comes to mind that are of excellent quality are the SIG's 4-star 40 and LT-25. Both are easy to build and the building instructions are excellent. Also there is a lot of experience amongst the RCU community with these aircraft so help is always at hand.

Happy building (and flying)!