Her husband built a career as a bank manager and married Rie, his former subordinate. They purchased a house in the suburbs, living a wealthy and peaceful life. However, after a work-related mistake, he lost his job, became addicted to alcohol, and started isolating himself at home. His domineering attitude left the mother and son powerless to oppose him, forcing them to endure their suffering in silence. The husband began treating the mother sexually, further eroding the family's bonds. One day, the son found his feelings for his mother growing stronger, developing a deep desire to cherish and protect her. Gradually, his affection intensified into obsessive love. Soon, the son initiated a dual sexual relationship involving both himself and his stepfather. As time passed, the mother's body began responding to the son's desires, and their forbidden love grew ever deeper...