While her husband is away on a business trip overseas, Miyashita Mai is suddenly attacked and raped by a stranger on her way home from shopping. Unable to confide in anyone, she carries deep guilt and emotional trauma. One day, she meets Dr. Yoshino, a depth psychologist. Sensing her inner pain immediately, he offers her a special form of therapy designed to heal her. Drawn to his warmth, Mai gradually begins to trust and depend on him. Before long, she secretly invites him to stay at her home without her husband's knowledge, and they start a clandestine affair. However, Yoshino's true intention is to completely dominate Mai, treating her like his personal pet. Unaware, Mai has already stepped onto a path from which there is no return.