Following a traumatic experience at the National Music Band Competition, Kumiko decided to quit music permanently. As she begins her first year at Kitauji High School, she finds herself drawn back into it. However, the school's band is in dire straits. Although they once achieved good results in the national competition, they now fail to advance beyond the regional qualifiers. Amidst this situation, Kumiko encounters Reina, the last person she ever wanted to see again. Will Kitauji High be able to pull itself together as the concert date approaches?!