Mami Mashiro, an adolescent sister who pretends to be unconscious and makes him erect with seductive panty shots
Mami, the adolescent sister of her parents' remarriage, is a beautiful girl, but incredibly selfish. It turns out that he is fascinated by the panty shots of his girlfriend's younger sister Mami. Since that day, she has been seduced by Mami, who is curious about sex, and has been forced to do whatever she wants.
