After marrying Yukiyuki, the daughter of the company president, her husband secures a managerial position thanks to her influence. However, his performance in the bedroom and his reputation within the company remain unsatisfactory. Meanwhile, his younger brother-in-law and subordinate stands out as capable and strong, gradually captivating Yukiyuki's heart with his charm. Torn by dissatisfaction in her marriage, Yukiyuki finds herself growing closer to her brother-in-law, their bond deepening into an illicit passion.