Mariko’s once-happy marriage falls apart when Saji, her husband’s younger boss, reveals that her husband has caused a major loss at work. As she struggles to accept the wrongdoing committed by the man she trusted, Saji tells her, “If you want to save your husband, you’ll have to do exactly as I say,” and demands sexual service. Mariko resolves to offer him her body for her husband’s sake, only to be subjected to humiliating training and tamed into his personal breast slave.