The band syh, featuring Hiiragi Kashima and Shizusumi "Shizu" Yagi, faces a crisis before their debut when their support guitarist quits. Hiiragi persuades Ritsuka Uenoyama, the arrogant boyfriend of his childhood friend Mafuyu Satou, to join them temporarily, despite their frequent conflicts. Hiiragi respects Uenoyama’s skill and asks him to finish a song Mafuyu’s ex, Yuki Yoshida, left unfinished. While working on the music video and recordings, Hiiragi grapples with his feelings for Shizu. Simultaneously, the band given, consisting of Uenoyama, Mafuyu, Haruki Nakayama, and Akihiko Kaji, gets an offer to debut. While the others are eager, Mafuyu hesitates, having never considered a professional music career. As Uenoyama tries to capture Yuki’s unique sound, Mafuyu withdraws to reflect on the impending changes and the uncertainty of his future.