Furuya is thrilled when Sara, a beautiful and popular classmate, confesses to him, but once they start dating her constant surveillance smothers him. Pushed past his limit, he kills her. Sara had sworn nothing would ever part them, and she keeps that promise, coming back as a calm, seemingly ordinary ghost who simply stays at his side. Seeing her this way, Furuya starts to wonder whether he misread her all along, and the guilt piles up.