After a certain incident, the uncivilized Narushima family moves into the refined Matsumura household. The eldest son of the Narishimas, Shota, becomes interested in the Matsumuras' eldest daughter, Misuzu. Though she initially despises Shota for his domineering behavior, her inexperience makes her vulnerable, and he gradually breaks her down until she begins moaning against her will. Ultimately, she climaxes in a shrimp-like arch, receiving his creampie. Obeying Shota's commands, Misuzu laps with her tongue, completely overwhelmed by pleasure. The downfall of the invaded family begins. A few days later, Narushima senior, Tatsuya, remarks, "Misuzu is such a good girl," pulling her into his arms. Submissive and compliant, she accepts him completely—performing deep throat and receiving handjob after handjob until she squirts, then pleading, "I want my reward," as she spreads her pussy wide. Tatsuya fills her with creampie after creampie, clearly intending to get her pregnant. After repeatedly creampie-fucking his own wife, he now sets his sights on impregnating the daughter too. Witnessing this, the Matsumura father, Seiichi, is driven to the brink of mental collapse, left dazed and powerless.