An extremely shy man who dislikes being around people and never removes his mask in public kidnaps schoolgirl Ruru Cha and confines her in his home. The house is equipped with one-way mirrors, allowing him to constantly monitor her every move. Though he feels safe knowing no one else can see inside, Ruru Cha is stripped of all autonomy—unable to initiate any form of communication, she is forced to obey the man's commands without question. As her fear intensifies, she gradually submits to his instructions, undergoing a cruel process of psychological and physical conditioning. With each passing moment, terror and anxiety deepen within her, drawing her further into the man's complete control.