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!

Listen to the whistling of the birds
استمع لصفصفة الطيور
♪ Listen to the whispering of the birds ♪
Listen to the whistling of the birds.
Listen to the whistling of the birds.
Listen to the whistling of the birds
Listen to the whistling of the birds
Ouça o canto dos pássaros
Прислушайся к щебетанию птиц.