Sisters Ai and Hikaru, who lost their mother, lived with their father who ran an inn, but due to hardships, their father was hospitalized. - The older sister, who is at a loss, decides to manage things with her sisters. - However, the customer who came was a businessman from whom he had borrowed business funds, which had been a source of stress for his father. - They set their sights on the sisters and deceive their younger sister Hikaru and take possession of her body... - He shows the footage of the scene to his older sister Ai and threatens her, and eventually he imprisons her sister's mind and body and trains her to have continuous vaginal cum shot, which inevitably leads to pregnancy.