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.

After the success of the School Fair concert, Haruki and Ogiso fall in love. But the two of them still want to include Kazusa just like they have so far. Kazusa answers by affirming her friendship with Setsuna, and on the surface things continue as before. And before much time has passed at all, the second semester is over and winter break begins. Setsuna and Kazusa drag Haruki on a Christmas hot springs vacation, and they enjoy their last big, fun, event.

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...