On the surface, Dai Miyamoto appears to be an ordinary high school student, distinguished only by his unwavering optimism and resolve to give his all regardless of the difficulty. He faces every hurdle with the conviction that success might always be attainable. A friend introduces Dai to jazz, and he is immediately struck by its power. Although those around him rarely grasp the intensity of his new passion, he devotes himself to daily saxophone practice. As his circle begins to back his ambition, Dai commits to perfecting jazz with a single objective: to become the world's greatest jazz musician.