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!

Being so considerate is wearing me out.
كلّ هذه المراعاة تنهكني
Da kann ich nicht
auf alles achtgeben.
C’est fatigant de faire attention.
Dover prestare attenzione a tutto è estenuante!
Тяжело быть таким понимающим.