One evening in fall, Haruki Kitahara looks out the window and plays his guitar in the direction of the festival stage set up outside; this was the simple little adventure that the conscientious honor student had hoped for.

Haruki is entranced by Setsuna's singing on the rooftop and plots to get her to join the Light Music Club no matter what; but she hates standing out, so convincing her is incredibly difficult.

The elite student in music room two 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; his pushiness backfires, and only makes her more annoyed.

One evening in fall, Haruki Kitahara looks out the window and plays his guitar in the direction of the festival stage set up outside; this was the simple little adventure that the conscientious honor student had hoped for.

Setsuna realizes that Haruki has been staying at Kazusa's house this whole time and she reveals her true self to him; Haruki accepts her as she is; the boundary between them is broken, and the bonds between the three grow stronger.

Kazusa's overworking finally catches up to her and she collapses two days before the school fair; Haruki cares for her as he continues to practice his guitar; Kazusa tells him about her troubled relationship with her mother Youko.