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!

Grandma, I'm an orchestra conductor!
!جدّتي، أنا قائد أوركسترا
Oma, ich dirigiere Orchester!
¡Abuela, pero yo soy
director de orquesta!
¡Abuela, que soy director de orquesta!
Réfléchis, la vioque !
Je dirige des orchestres, moi !
Nonnina, ma io sono un direttore d'orchestra!
Vovó, eu sou maestro de orquestra!
Бабушка, я дирижёр оркестра!