Tenshi, Ei y Shiratori son tres estudiantes de la academia privada Kawagoe Gakuen. Un día, por azar del destino, se cruzan con Haruo, un ex director de orquesta extravagante que aparece de repente y les obliga a unirse al recién creado coro masculino. ¡Cuando se dan cuenta, los tres se encuentran interpretando una canción delante del público!

Aunque el club no haya hecho más que arrancar, aún necesitan más miembros. La directora de la academia ha encontrado a unos candidatos perfectos, pero el problema es que no quieren unirse al coro.

Ahora que el coro masculino va tomando forma y experiencia, es hora de ensayar para realizar una actuación ante un público de verdad. Sin embargo, siguen faltando miembros para el coro, así que la directora tiene que invitar a más miembros a cantar.

La directora encuentra un vídeo misterioso que ha aparecido en Internet. En él, dos chicos sin identificar consiguen una puntuación perfecta cantando en un karaoke, así que encomienda a Haruo que descubra quiénes son y los convenza para entrar en el club, pero encontrar a alguien solo por su voz no es una tarea nada fácil.

Now that the choir has ten members, it's time to get serious about entering the Kanto boys choir competition! The boys find out that last year's national winners are performing at a festival, so they go to check them out. Then they run into Maiden's dad!

The choir heads into the mountains for a singing training camp, but when they arrive, they discover that the site they'd reserved is already being used by a rival school! Meanwhile, Haruo refuses to do anything but...look for kabocha squash?

It's time for the choir to start rehearsing in earnest, but the AC is broken and it's too hot to think. They move to somewhere cooler, and Rika gives them a song to hone their rhythm. Then, they're swept up in a series of inexplicable events!

IT hasn't been to school for a whole week. The whole choir is worried. Haruo spots IT in the street and drags him to choir practice, but he doesn't seem himself. Rika and Haruo visit his home to check on him and are shocked by what they find!

The choir is still reeling from the loss of one of their members, but they're determined to practice as hard as they can for the upcoming competition. Unfortunately, their parents aren't happy about the choir's late hours and they complain to the school!

It's finally time for the Kanto competition. Day one is the set piece performances and all of the choir's rivals are there. Will everything go exactly the way they've rehearsed, or should they expect the unexpected?

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