Momoko is married to a man with a child from a previous marriage. She has a good relationship with her husband, but she has difficulty opening up to her son, Naoki, and their relationship is awkward. Worried about this, her husband plans a family trip, but... In fact, Naoki sees her as a woman, not a mother. Unable to suppress his desire at her defenseless appearance, he finally rapes her in the night. The impact of his violent penetration deep into her vagina and his powerful thrusts that never end. Momoko's body is in perfect harmony with Naoki's sex, something she has never felt with her husband...