In the game you play as Haneru, perform moves on streets or stages to get to the goal and if their are audiences, their cheeing will be used to fill your power level. Keep level up to increase the amount of friends you're dancing with. Unlock up to Kanon, Kumo, Mizuki and Yuzuru.
There are also an app for IOs and Android. Download for IOs here and Android here. Details can be found on the directed page.