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Dai lived a normal high school life in Sendai: a city of hot summer days and rainy nights. Between basketball, part time jobs, and an uncertain future, something was missing. And that thing was music. With his days in senior year running out, Dai swears a heartfelt vow: “I’m gonna be the best jazz player in the world.” But what do you need to be the best? Talent? Effort? A lucky break? Or maybe just a deep, pure love for music, and too much stubbornness to know when to quit.
Spring in the first year of high school. Kumiko, a member of the brass band in junior high school, visits the high school brass band club with classmates Hazuki and Sapphire. There, she comes across Reina, her former classmate from junior high. Hazuki and Sapphire decide to join the club, but Kumiko can’t make up her mind. She recollects her experience with Reina at a competition in junior high school.
Having won first place in the Kyoto Concert Band Competition, the Kitauji High School Concert Band prepares to go up against the many esteemed bands competing in the Kansai competition.
Kai was born as the son of a prostitute and he's been playing the abandoned piano in the forest near his home ever since he was young. Shūhei, on the other hand, was practically breast-fed by the piano as the son of a family of prestigious pianists. Yet it is their common bond with the piano that eventually intertwines their paths in life.
After the first stage of the Chopin competition, Kai and Shuhei prepare for the next round while confronting their own reasons for playing music.