Ten years have passed since their mother passed away. The man who was her husband... Mizuno Hideo. The two of them start living together as a family of three with him, who is also their stepfather. Hideo was kind at first, but his attachment to them grows day by day, and now he goes beyond restraining them to dominating them. The elder sister, Natsuko, is 35, and the younger, Kozue, is 30. Having given up on a normal life, the only pleasure they have is to have sex together. Is it dependence or a price to pay? What awaits them at the end of this endless pleasure...?
