To save money for a home of her own, Mayu moves into her husband's family home. Life remains peaceful until her father-in-law, Toshiro, comes home celebrating a huge payout on a long-shot betting ticket. Mayu's unguarded appearance gets the insatiably horny man hard, and he decides to use the ticket to force a sexual relationship with her. Toshiro frames Mayu for its disappearance, exploits her vulnerable position, and rapes her—but his abuse does not end there.