A man who is interested in the beautiful Izumi who lives next door observes her behavior in detail... At first glance, she appears to be a good wife who supports her husband, but as he continues to observe her, he discovers that she is having an affair with the manager. The man next door uses the evidence of the affair to blackmail Izumi and force her into a physical relationship... At first, Izumi reluctantly submits to his orders, but as the man trains her, her masochistic side blossoms!