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.

In order to try to convince Mafuyu to join their band, Ritsuka takes the song that Mafuyu has stuck in his head and arranges it a bit. Mafuyu is a very quick learner and progressing pretty quickly with playing guitar and the band is on a roll as they find out that their first live show is coming up. But then, Ritsuka's classmate Ayano Kasai tells Ritsuka something about Mafuyu's past that shakes him up. Even then, Ritsuka starts to realize his feelings towards Mafuyu.

Mafuyu has been on Ritsuka's mind lately and while they're at band practice, he keeps pointing out everything Mafuyu is doing wrong and can't seem to hide his frustrations. Meanwhile, Mafuyu still hasn't written any lyrics. Akihiko proposes they stop practicing and he ends up talking to Ritsuka privately, pointing out that Ritsuka clearly has feelings for Mafuyu. Ritsuka is unsure if he should admit his feelings towards Mafuyu, but then he sees Mafuyu asleep as he is hugging a guitar, just like when they first met.

Ritsuka is scared of the lyrics Mafuyu is going to come up with and Ritsuka can't sort through his feelings. Meanwhile, Mafuyu's childhood friend Hiiragi tells Mafuyu that he regrets knowing everything that happened between him and his former boyfriend Yuki Yoshida. After talking to Hiiragi, Mafuyu is able to face his past a little better and invites him to their concert. But on the day of the concert, Mafuyu finds himself unable to sing.

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