Reiko lives an ordinary married life. Her only complaint is that her husband's libido has been declining recently, and their sex life isn't going well. One day, a man who claims to be her husband's new subordinate comes to the house. This man is the same man who once trained Reiko in rope sex, awakening her masochistic nature. Reiko can't hide her surprise and confusion at this chance reunion. "It's been a long time, Mrs." Her body, which had forgotten the past and gotten used to her ordinary married life with her husband, gradually begins to ache...