As a fresh year dawns upon Kitauji High School's concert band, a new chapter unfolds with the arrival of first-year juniors replacing the departing third-year seniors. With aspirations set on nationals, the band invests unwavering dedication in their practice sessions. Amidst this transition, the seasoned second-year Kumiko Oumae and her circle of friends clash with the eccentric newcomers, sparking tensions within the group. As time ticks on, emotions run high, unveiling hidden conflicts that prove arduous to resolve. The journey towards regionals not only tests their musical prowess but also strains the foundation of trust and camaraderie among the bandmates.