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Ritsuka Uenoyama (Jin Suzuki) is an excellent guitarist and high school student. One day as he's heading up the stairs to go to the roof, he discovers a mysterious student sitting on the stairs holding a Gibson with broken strings named Mafuyu Sato (Sanari). Mafuyu persistently asks Ritsuka to teach him guitar and Ritsuka ends up bringing him to the band practice of his band, "the seasons." Ritsuka performs for Mafuyu along with his bandmates, the drummer Akihiko Kaji (Kai Inowaki) and bassist Haruki Nakayama (Shuntaro Yanagi). Ritsuka's face is beaming as he performs...

Ritsuka starts teaching Mafuyu how to play guitar. Ritsuka couldn't help but wonder why a beginner like Mafuyu would have a guitar like the Gibson he owned. One day, Ritsuka hears Mafuyu sing and it rocks him to the core so he asks Mafuyu to join his band, the seasons. To his surprise, Mafuyu declines. Then suddenly, someone named Hiiragi Kashima (So Okuno) appears and he seems to know about Mafuyu's past...

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（Rico Nagase）tells Ritsuka something about Mafuyu's past that shakes him up. Even then, Ritsuka starts to realize his feelings towards Mafuyu, and...

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 (Akira Onodera ). 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...

As Ritsuka runs to buy guitar strings, he remembers how hard Mafuyu had been working. As Ritsuka once again changes Mafuyu's guitar strings just like they first met, he tells Mafuyu his honest feelings and how much more fun he's having right now. Despite being a bit awkward, their feelings reach each other. Finally, "the seasons" first performance with Mafuyu is about to begin...