Kasumi lives a quiet, ordinary life with her husband, Mitsuo. One night, Mitsuo comes home drunk with his boss, Tajima, who has wanted Kasumi for some time. Once Mitsuo falls asleep, Tajima pins her down and rapes her. One assault is not enough for him: he keeps returning to the Okazaki home and using Kasumi like a sex toy. She fiercely resists him at first, both physically and emotionally, but Tajima gradually breaks her down through repeated sexual abuse...