Kouno Seiichirou, a novelist whose heart remained unsatisfied despite having inherited a large amount of money. One day, he is suddenly approached by his maid, Hayabusa Miwa, whom had served the family for a long time. He began to become conscious of her as a woman. His stepmother, Kouno Sayuki, was still a relatively young woman, and so her motherly instincts were still present. Despite being his mother, she pampered Seiichirou out of animosity for Miwa, and before long, the two of them ended up in physical relationship. The forbidden act escalated, and before long, she got pregnant. What will happen to the Mukono family as this dangerous and sweet poison goes around?