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!

I'll call the police.
سأتّصل بالشرطة
Gleich rufe ich die Polizei!
Je vais appeler la police.
Chiamo la polizia!
Vou chamar a polícia.
Я вызову полицию.