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!

Say, you have really good posture.
لديك وضعيّةٌ جيدة
Du bist gut in Form, was?
Oye, qué buena postura.
Oye, qué buena postura.
T’as une bonne posture, dis donc.
Tu hai un bel portamento.
Seu físico é bom, hein?
Ого, хорошая осанка.