25-year-old newlywed Shoko lives happily as a full-time housewife. However, her life takes a dark turn when her husband, working at a major securities company, is ordered to host the boss's son, Mario, for several days. Mario, a motherless young man with twisted desires, fixates on Shoko with a mix of longing and malice, soon plotting to claim her for himself. While forcing her to call her husband and pretend everything is normal, he subjects her to brutal rape, urinates on her in the bathroom, forces her into aggressive blowjobs, drags in his delinquent friends for a violent threesome, rapes her while she sleeps in the marital bed, and ultimately degrades her into a pet-like sex slave. As the relentless abuse continues, Shoko's mind begins to shatter, spiraling into a chain of tragedy.