After securing victory in the Kansai regional qualifiers, the concert band of Kitauji High School prepares for their next big show. They decide to attend a camp organized by their band mentor, Noboru Taki, and his talented musician colleagues to make the most of their summer vacation. Despite being fully committed to winning the gold at the Kansai tournament, Kumiko Oumae and her bandmates face a challenge when a former band member expresses interest in rejoining, bringing back unpleasant memories for the second-year players. Meanwhile, Kumiko discovers something unexpected about her mentor's past, revealing his drive to lead the band to success. With unflagging determination and hard work, they set out to achieve their goal of making it to the national competition, testing their loyalty and dedication along the way.