Yokohama Xebec is a marching band that represents the city of Yokohama. The members attempt to concentrate on their practices to win at the national competition, but Tadanobu (Dori Sakurada) wants to leave the marching band to go solo. Atsushi (Kazuhiro Sawada) is in anguish over balancing his job and practice time for the marching band. Both Tadanobu and Atsushi are in the brass section of the marching band, which is nowin a state of disorder. The leader of the marching band, Mari (Seika Taketomi), struggles to lead the band.