Hikaru Kusakabe is an ordinary, carefree boy in a rock band who stays focused on the present. During the summer, his whole class is required to take part in an upcoming chorus festival. By chance, he finds his classmate Rihito Sajou—known as an honor student with top grades—practicing his singing alone. Sajou just cannot seem to get their class' song right, and Kusakabe, delighted at seeing a new side of his straight-laced classmate, offers to help him prepare for the event. Although their lives and personalities are total opposites, they begin to grow closer as time progresses. But with the pressure of an unknown future, what will become of them and their growing relationship?