Miyuki, a young married woman living with her ordinary husband and father-in-law, sees her daily life take a drastic turn one day. The balance of her household begins to crumble when her husband invites his company superior over for dinner. This superior is the very man who once subjected Miyuki to intense sexual training. His visit triggers the gradual breakdown of her marriage, and as tensions rise, the father-in-law seizes the opportunity, developing an abnormal obsession with Miyuki. Within this twisted family dynamic, the dormant, perverse desires buried deep within Miyuki's mind begin to awaken once more, driving her toward a shocking new chapter.