On a fall day a month before the school fair, Haruki Kitahara's Light Music Club is about to be disbanded, thanks to trouble caused by their beautiful vocalist, Tomo Yanagihara. Haruki tries to find a new member, but despite his own problems he's forced to help with the School Fair Committee too. There he meets Setsuna Ogiso, winner of the Miss Houjou contest for two years running, who wants to withdraw from this year's contest.

The "elite student in music room 2" turns out to be Haruki's delinquent classmate, Kazusa Touma. With his characteristic pushiness, he tries to get her to join the light music club. But his pushiness backfires, and only makes her more annoyed. Setsuna gets irritated... no, involved, and approaches Kazusa secretly.

Haruki hears about Kazusa's moving from her mother, who she hadn't been on good terms with. He feels betrayed and angrily confronts her. But his words force open the door to Kazusa's heart, which she had desperately tried to keep closed so that the three of them could stay together.

At last, Haruki sleeps with Kazusa. Her wish finally comes true, and she prepares to leave for Europe. Haruki takes Setsuna to the airport, hoping that they can all be together once again. When the three are reunited, everyone remembers the best moment of their lives: the last song they sang at the school concert. The title of the song was...