A Concentrated Dose of Japan
This game is exactly the kind of cute, crazy, colorful fun you think of when it comes to Japanese arcades. Once I tried one of the arcade machines at a convention, I immediately ordered the DS game so I could play it at home, and it well worth getting.
There's a wealth of content, with some 50 tracks, a variety of costume pieces and alternate taiko drums, plus a new adventure mode. You get two drumstick stylii to play the game with, plus some stickers. Gameplay-wise, if you've ever played Donkey Konga, this is a very similar concept. Red means hit the drum, blue means hit the edge, and there are other special notes like drumrolls.
Don't worry about the language barrier, you shouldn't have any real problems with this game, and there are guides available online if you do. I'd highly recommend this game to anyone who likes rhythm games and/or FUN.