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!

What's important here is that you sang 
in front of those two during practice.
المهمّ هنا هو أنّك غنّيت
أمام هذين أثناء التمرين
Lo que importa es que cantaste
en los ensayos delante de ellos, ¿no?
Lo que importa es que has cantado
en los ensayos delante de ellos, ¿no?
Tu as pu chanter devant tes amis
pendant vos répétitions.
durante gli esercizi hai cantato davanti a loro due, no?
Послушай, ты ведь пел 
перед друзьями, когда готовился.