Music is fun! Kazunade Umezuka enters Shizugaoka Gakuen, a prestigious track and field school, but after a setback with the track and field team, she decides to join the brass band club. Although confused by the gymnastic and spartan practices of the brass band, Kazunade gradually realizes the joy of music and brass band music. However, Mutsumi Shinozaki, who is also in the trumpet section, becomes increasingly isolated from the rest of the club, despite her skillful performance.