The story revolves around five Japanese high‑school seniors, too young to be called adults but who no longer wish to consider themselves children. Wakana Sakai once took music lessons, but she gave up music after losing her mother. Konatsu Miyamoto is an optimistic girl who loves to sing; she spends time after school in the choir club. Sawa Okita is an energetic member of the archery club who dreams of becoming a rider. Taiti Tanaka, the perpetually late member of the badminton club, lives with his older sister, a college student. "Viin" has just transferred into Wakana"s class after living in Australia for 12 years. Music brings Wakana, Konatsu, Sawa and others together into an ensemble during their last summer of high school.