"The world is trash because it doesn't understand me" - Megumi spits out these words, blaming everyone around her for her job failure and retreating to her room. With a complete lack of manners, she alienates her family and friends, until she meets a rumored to be a devilish etiquette instructor. While he appears to be a strict instructor, in reality he is a despicable man who abuses his position as instructor and enjoys sexually harassing female students. Ironically, this trash human uses his smartphone to hypnotize and brainwash Meguri... and he gradually takes control of her mind and body, completely changing her.