Sudden transfer brings her husband's friend, Takahashi, to Tokyo. With no place to stay, her husband insists Takahashi move in with them, despite her hesitation. That night, Takahashi—long captivated by Nozomi's charm—takes advantage of her sleeping husband and seduces her. This single moment marks the beginning of a new relationship. Under the guise of cohabitation, Takahashi gradually dominates Nozomi, slowly opening her mind and body. Before long, Nozomi herself begins craving him. This story portrays the unexpected changes and temptations brought by a man intruding upon a couple's everyday life.