The Kitauji High School Concert Band Club had at one time participated in national tournaments and was a championship-caliber school, but after the club's adviser changed, they had not been able to even participate in the qualifying tournament. However, thanks to the newly appointed adviser's strict instruction, the students are steadily improving and build up their strength. As they fight over who plays solos, some students give priority to studying and quit club activities. Finally, the long wished-for day of the competition arrives, and the club wins the qualifying tournament.
久美子在初中時對同是管樂團成員的高坂麗奈失言,因而一直耿耿於懷,更為此而選擇了很少同學升讀的高中。久美子进入北宇治高校,然而開學首日中,她听见北宇治管樂團的演奏却是不濟。本來打算一切重新開始的久美子,卻在參觀管樂團練習時再次遇見麗奈。