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!

Here I am, a professional conductor.
أنا قائد أوركسترا مُحترف
Soy director profesional.
Soy director profesional.
À la base,
je suis chef d’orchestre.
E pensare che sono un direttore professionista.
E olha que sou maestro de orquestra...
И это он говорит профдирижёру.