A man who is so extremely shy that he doesn't want to take off his mask in public kidnaps a high school girl, Ruru-chan. He locks her up in his home with a one-way mirror and constantly monitors her. Here, he can be safe and secure, knowing she won't see him. Although Ruru-chan realizes nothing is being done to her, she can only communicate one-sidedly and gradually becomes tormented by fear. Due to her fear, she can only obey the man's commands and is slowly trained.
