Riko, a high school girl, is kidnapped by a perverse pleasure-seeking torturer and locked in a room. When she wakes up, she finds herself wearing a full-head mask and her fingers tied to a school desk with torture devices. Electric currents are applied to her body from her fingertips, making her numb, and she experiences such fear that she urinates. The horrific torture continues on the sacrificed girl. She is suffocated with a wet cloth over her face, tied to the desk and forced to perform an intense deep throat blowjob, and is tied up in a V-shape and tortured with toys, making her cum over and over again. A sudden tragedy strikes this innocent girl.