**Uta Komaki** is a timid first-year high school student whose deep love for singing clashes with her intense shyness and self-described cowardice. Paralyzed by the dazzling confidence of the light music club members, she cannot bring herself to apply, despite her desire to join. A chance invitation from **Airi Kojo** offers her a different path: the **a cappella club**. This group, a band of unconventional misfits, provides a space where Uta can participate without needing overt confidence or flashiness. Focusing solely on vocal harmony, the club allows her to explore singing in a new context, eventually stepping into the role of **lead vocals**. Uta's journey becomes one of connection and self-discovery through a cappella, embodying the theme that one doesn't need to shine to experience youth, finding value in quieter expression and community.