Five years after marrying his former coworker Hijiri, their relationship remains strong and he is about to be promoted. They even help their boss, Mr. Ozawa, move house together. Days later, Ozawa confesses that he is having an affair with a married woman and offers to show proof. In the designated Japanese-style room, the husband discovers a one-way mirror—and watches Hijiri, who was supposed to be out, enter the room on the other side.