To play Japanese 3DS games (retail, eShop Downloads, DSiWare), you must own a Japanese system. If you really want the game so bad, import yourself one (usually costs a bit more than the system from your region), and finally download the game (around $63 CAD) before NA/EU release. I strongly suggest you already learned Japanese before doing so.
It's interesting to note that a few 3DS games actually allow you to play local multiplayer between systems with different regions, but I don't know what those games. Also, all DS games are region-free.