I picked this up yesterday. So far, I'm loving it. The basic premise is that you are a three-man "cheer" team, and you go around your city trying to pump up people who are having various problems. You are presented with a map screen, which you can drag around to see the various people who need help. You pick somebody, their story starts, and as you play, how well you do determines how the character deals with their problem.
I haven't seen the videos, so you might already know this, but there are two basics to gameplay. First, the usual thing is a number inside a circle, with a ring that shrinks into the circle. When the ring matches the circle, you have to tap it. If there are multiple circles onscreen at the same time, you have to do them in numeric order. The other thing is a circled number with a track. When you hit the number, a ball will roll along the track, and you have to follow it with the stylus. During play, your life meter is constantly going down, and hitting the points with better timing raises it back up a little. There are two main options, Easy and Hard. There's also a multi-player mode, but I've had no chance to try it out yet. It seems like true multi-player requires multiple carts.
So far, the challenge is pretty decent. I'm three songs in so far, and I'm already feeling a bit of pressure. The game is pretty strict on your hits, so you won't be acing the songs the first time through. I'd say that if you like rhythm games, and want something new for the DS, absolutely pick it up. You'll miss out a bit on the storylines if you know no Japanese, but so far I think anybody could figure out the main idea behind each character's story without much problem.
