Two schoolgirls living with their stepfather are gradually trained by him, their young bodies molded under his control. Dominated by his strong will and desire for power, they slowly lose their sense of self. Wearing collars and tormented with lewd devices, their bodies are used and violated at his whim. Under the stepfather's complete domination, they transform into sex slaves and become his absolute property. This work depicts how these pure girls are utterly transformed by the hands of their stepfather.