Saeko Matsushita stars as a woman who has spent years suppressing her past addiction to sex, choosing instead to live a quiet, peaceful life. However, her composure is shattered one night when she accidentally witnesses her daughter's intimate life. She is shocked to see her son-in-law—usually a gentle and mild-mannered man—dominating her daughter like a beast. The sight of his raw, unmatched power reawakens Saeko’s dormant memories and triggers an insatiable craving. When her daughter leaves for a training trip, Saeko seizes the opportunity. She seduces her son-in-law, launching a relentless attack to claim his strength for herself. In a desperate, high-stamina battle of the flesh, she begs him to never stop—demanding he pour everything inside her until she is finally pregnant.