The mother, who had raised two daughters as a single mother, married an executive at a local bank six months ago and the family of four has been living a life of luxury. However, since the sick mother was hospitalized, the father's attitude has changed completely... The absence of the mother has caused his sexual desire to build up, and the stepfather, who has managed to get his older sister, Emi, hired by the bank through his connections, threatens her and trains her as a sex toy. He promised not to lay a hand on the younger sister, Akari, but the psychopathic stepfather easily breaks that promise, distorting the relationship between the sisters and causing the family to fall apart... The sisters, unable to resist, desperately suck his dick to satisfy their stepfather, providing sexual service with their young bodies and violating both Kokoro and bodies...