Rei’s once-happy marriage falls apart when Saji, her husband’s younger boss, tells her that her husband has caused a major loss at work. As she struggles to process the wrongdoing of the man she trusted, Saji demands sexual service and tells her that she must obey his every command if she wants to save her husband. Rei resolves to offer him her body and is put through humiliating training until she is tamed as his personal breast slave.