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!

If not our mouths, 
where are we supposed to sing from?
من أين نغنّي إذا ليس من أفواهنا؟
Womit sollen wir denn sonst singen?
¿Y cómo quieres que cantemos?
¿Y cómo quieres que cantemos?
Comment on est censés
faire autrement ?
E da dove tiriamo fuori la voce, se non dalla bocca?
E de onde que se canta se não da boca?
А чем петь-то, если не ртом?