Tenshi, Ei-chan, and Shiratori all attend Kawagoe Academy. One day, they get pulled into the orbit of former conductor Haruo. He drags them into his newly founded boys choir where they suddenly find themselves performing a song in front of an audience!

Welp, see you after class!
!حسناً، ألقاكم بعد الدروس
Dann bis nach der Schule!
Los veré después de clase.
Os veré después de clase.
Allez, on se voit après les cours.
Allora, a dopo le lezioni!
Bem, nos vemos depois da aula.
Ну, жду вас всех после уроков!