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!

Before we realize it, 
we've spent the day together
دون أن نلحظ، أمضنا اليوم معاً
On se retrouvera encore ce soir
Prima di accorgercene, la scuola è già finita.
Facciamo qualcosa insieme anche oggi.
As aulas acabaram,
mas vamos curtir em outro lugar
Мы не заметили, а уже прошёл весь день