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!

Why are we doing this?!
!لمَ نقوم بهذا؟
Warum muss das jetzt sein?!
Pourquoi on doit faire ça ?
Ma perché ci siamo fatti coinvolgere?
Зачем мы в это ввязались?!