March begins, and there is only one month left in the third term. Sakuta Azusagawa is about to celebrate the graduation of his girlfriend Mai Sakurajima. As he waits for Mai at Shichirigahama beach, an elementary school-aged girl who looks like Mai did when she was a child actress appears in front of him. "Who are you, Mister?" she asks. Is this a dream or an illusion? As he thinks about this...