A senior high school student, Satoshi and Rin decide to play in a band at the school festival. But soon after they had a successful gig, Rin becomes hospitalized with a terminal illness. Satoshi tells his feeling for her right before she dies but Rin rejects him. Satoshi realizes and regrets that he has hurt Rin despite she didn’t have much time left. But all of a sudden, he slips back in 6 months ago where he had met Rin for the first time…Satoshi’s second summer has just started.