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!

Then you use the deepest—
—ثمّ تستعمل أعمق
– mais aussi avec…
– Occupez-vous de Latelle !
Professore, il tasso del miele!
Então, bem do fundo da barriga...
Тогда голос...