Ami's mother remarried and she got a new father and brother. For the sake of her mother's happiness, she awkwardly started living with her family. She felt relieved that she could open up to her stepfather who treated her kindly. One afternoon, as Ami was dozing off, her stepfather took off his mask and began to show his true face. In front of the innocent body of his unrelated daughter, he unashamedly exposed his poisonous fangs. He greedily savored the hairless pistil, and once he got the taste, he began to desire it even in the presence of his wife...