Synopsis：After their parents died in an accident, our MC lives with his sister Nana. They grow up together, sharing both sorrowful and joyful moments. But one day, Nana is forced into a terrible situation—she is attacked by a group of wealthy individuals and suffers severe trauma. Seeking revenge against those corrupt rich people, the MC becomes a high school teacher, teaching the daughters of the wealthy. Seizing the moment, he invites them to a remote villa for supplementary lessons. He locks the doors to ensure none of them can escape and carries out his first act of revenge on a girl named Ruriko, who holds the utmost respect for her filthy father—the one who orchestrated the attack on MC's sister. The remaining girls try to flee, but can they escape the MC's wrath?