Aoi Okana is 40 years old. Despite being a housewife, she maintains a perfect H-cup hourglass figure even now, in her 16th year of marriage and with one child. As the years pass, her mature allure only grows, causing her worrywart husband to confine her to the house like a bird in a cage out of concern for her desire to work outside. Yet, their nightly activities decrease year by year… Aoi, who has always been laid-back and never assertive, finally snaps under years of stress. 'We had our first marital fight.' Her sexual desires, no longer controllable through masturbation alone, give rise to infidelity fantasies, leading her to open the door to her first-ever affair in her 40s.
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