Dynamic Chord feat. Rêve Parfait

2nd-year high school student Atano Rio has childhood friends. They are Kashii Reon and his older brother Kashii Aki. However, due to a certain incident, she has become estranged from Reon. One day, Rio is lead to a certain studio by Kuon, whom is an upperclassman she's close to and also Aki's friend. It is there that she learns that the three—Reon, Aki and Kuon—had formed a band together. However, their band's bassist had dropped out... The love between you and the high school band-men aiming for a major debut... Where will it lead?