Kamine Shouta is a boy who is able to "see" people's hearts, though the ability has caused him to distance himself from people. His meeting with saxophone player Tokisaka Hibiki changes both of them for the better, and Tokisaka convinces Kamine to join the school concert band. Now Kamine, who knows nothing about music, will have to use his ability to win over the band's section leaders in the hopes of leading the band to the national competition next year… as its conductor!