Dai Miyamoto, a student from Sendai, receives a saxophone as a gift from his brother, Masayuki. He starts practicing immediately.

Dai Miyamoto is in the basketball club in middle school. One day, his friend takes him to a live jazz performance, which touches him on a deep level. From that point on, he begins to practice the tenor sax by himself, with no formal education, and no ability to read sheet music. He aims to become the world's best saxophone player.