Given

A high school student with outstanding guitar technique, Tatsunatsu Uenoyama meets a mysterious classmate, Satou Mafuyu, who holds a Gibson with a broken string at the landing of the stairs leading to the roof of the school. Uenoyama takes him to the practice of his own band. Uenoyama shows a performance with Akihiko Kaji on drums and Haruki Nakayama on bass.

Ritsuka makes an offer to let Mafuyu join his band after being shocked by his vocal abilities.