Childhood friends Haruta and Chika are members of their high school wind instrument club that is on the verge of being shutdown because there are only four members. When a mysterious event occurs within their school, they band together in order to solve the mystery.
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A first year high school student who quit her volleyball club, in spite of being a powerful player, to join the wind instrument club in an effort to become more feminine. She is Haruta's childhood friend.
A first year high school student who is in the wind instruments club. He plays the horn and is Chika's childhood friend.
He was once a conductor as he had hoped of becoming, but now this mysterious 26-year-old serves as the advisor of the Wind Instument Club.
"Niji wo Ametara" by fhána
"Kuusou Triangle" by ChouCho
Sarah Emi Bridcutt as Homura Chika; Saito Soma as Kamijou Haruta; Hanae Natsuki as Kusakabe Shinjirou