First year high school student Ari is fascinated by Youta-kun, the leader of a popular indies band, and ends up joining the band herself as a keyboardist.

About a school who has an elite section and a regular section. These sections are always at war; however, for the next school festival, the leaders (matsuriya) from both sides want to work together to make it a good school festival.
(Source: Rebellious Love)