Tsubasa, a girl who lacks self-confidence, wants to voice her opinion through her instrument of choice, trumpet, while Daisuke wants to join the school's baseball club and win the regional championship.

Nevertheless, with Daisuke's encouragement, Tsubasa holds on and slowly learns the art of a trumpeter, aided by her upperclassman, Yuka Mori.

When Yuka becomes depressed after being dismissed from the national championship team due to an injury, Tsubasa stubbornly visits her apartment to ask for her return.

Meanwhile, the baseball team also loses the regional champion title that year, but Daisuke is touched when Tsubasa plays the winning march solo despite being forbidden to do so, which earns her a lash out from her teacher.

During the credits, Shirato's brass band team is shown participating in the national championship and winning the gold medal.