Cytus 2

This is a rhythm game that manages to add some story without being odd it's a game where a DJ holds his first main big concert. A DJ of some notoriety bringing in some other top DJ's and idols and has some absolutely great music to do fairly basic but tried-and-true rhythm mechanics too.

The story unfolds on message boards which you can participate in, well in between songs and it's actually interesting. It's not perfect, it;s not the thing you've ever seen but for a rhythm game. It's damn good. I had a lot of fun with it and I you will as well.