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!

I've never taught ordinary people before.
لم يسبق وأن علّمت أشخاص عاديّين قبلاً
Normalos unterrichte ich
zum ersten Mal.
Es mi primera vez
enseñando a gente del montón.
Es mi primera vez
enseñando a gente normal.
J’ai jamais eu
une brochette de débutants.
Perché è la prima volta che insegno a persone comuni.
Afinal, é a primeira vez
que ensino gente ordinária!
Обычных людей я никогда не обучал.