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Mafuyu Satō, clutching a battered Gibson, steps out of his dim apartment and drifts through another ordinary high‑school day. A chance meeting on a quiet gym staircase with classmate Ritsuka Uenoyama—who scolds him for neglecting his instrument—sparks an unlikely partnership. Ritsuka, impressed by Mafuyu’s raw vocal talent, invites him to join a fledgling band, hoping to turn his haunting voice into their centerpiece.

As Mafuyu learns chords and confidence alongside bassist Haruki and drummer Akihiko, he also confronts the enigmatic past that tethered the guitar to him. The series blends heartfelt music scenes with gentle coming‑of‑age drama, offering a tender look at friendship, self‑discovery, and the power of song.