Hikaru Kusakabe is a typical, carefree rock band member who is constantly focused on the present. During the summer, his entire class is required to participate in a choral festival. By chance, he comes upon his classmate Rihito Sajou, who is renowned for being an honor student with high marks, rehearsing his singing alone. Sajou can't seem to get their class song right, and Kusakabe, happy to discover a new side to his straight-laced classmate, offers to assist him in preparing for the event. Despite the fact that their lifestyles and personalities are diametrically opposed, they become closer over time. But, with the uncertainty of the future looming, what will become of them and their budding relationship?