A hotel cleaner moved to town a few months ago with his wife Rio, a former teacher. Despite his modest income, he believed they were happy. One day, Rio comes to the hotel with something he forgot and happens to meet Sugiura, her now-adult former student. Exploiting her inability to refuse, Sugiura aggressively pulls her into his room. From then on, he repeatedly summons Rio to secret meetings at the very hotel where her husband works, until her husband discovers the affair firsthand.