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!

Don't worry. You'll be building a boys choir.
لا تقلق، ستبني فرقة جوقة فتيان
Keine Sorge. Du sollst 
einen Knabenchor gründen.
Tranquilo.
Tranquilo.
Mais non.
Stai tranquillo.
Não se preocupe, você vai fazer
o clube de coral masculino.
Не волнуйся. 
Ты будешь создавать юношеский хор.