After hearing that his father is remarrying, a man reluctantly returns to his hometown. Uncomfortable around his father's new wife and her child, he leaves the house for a walk and unexpectedly meets An, the older schoolmate who was his first love. Delighted by their reunion, they reminisce until she says her husband Kazuya would also like to see him. Events move quickly, and he ends up staying at the Komatsu home for three days, where old feelings return and he loses himself in an affair with the now-married An.