Kazusa Ōtori, a resolute high school student at Kanagawa’s Himesaka Girls' Academy, balances her studies with fervent dedication to the koto club. Sharing her academic year with Chika Kudo, she is defined by sharp opinions and unyielding focus, committing fully to decisions once set. Her role extends beyond club activities, engaging actively with peers like Ousuke Kiryu, a talented koto player from a Tokyo high school, reflecting her collaborative yet competitive edge. Driven by a steadfast pursuit of excellence, Kazusa embodies the rigorous spirit of national koto competitions, channeling perseverance and directness into every goal within her school’s musical pursuits.