Like another member said getting a console for just a single game is a bad investment. Do some research and find some other games that you would like for the 3DS.
Some of my recommendations are Kid icarus uprising, Pokemon, Kirby, Mario, Zelda, and of course Fire Emblem: Awakening. There are many many games that make owning a 3DS worth it you just got to find what you like. There is also a new Fire Emblem game coming out next year for the 3DS as well so another good reason to get one.