Top student and class president Mio Katahira, daughter of a school board member, has always upheld a strong sense of justice. However, tragedy strikes when a man targeting the chairman pays a large sum of money to sell her into a secret training club. An innocent girl is dragged into crime, stripped naked, and forced to experience the hell of her first pleasure amid humiliation. In her despair, she gradually transforms, eventually devouring the cock of the man who sold her like a flesh doll. Her figure evolves into a beautiful, divine, and lustfully depraved girl reaching ecstatic climax.