Mariko’s once-happy marriage collapses when Saji, her husband’s younger boss, reveals that her husband has caused a major loss at work. While she struggles to process the wrongdoing of the man she trusted, Saji tells her that saving her husband will require complete obedience and sexual service. Mariko resolves to offer him her body, only to be dragged into humiliating training and conditioned to serve as his personal breast slave.