"Aki, how many times do I have to tell you?" Akihiko Narumiya, who is constantly criticized for his sloppy lifestyle, sighs deeply in his heart. Just as he is about to tell his sister to stop, a certain item he ordered online arrives at his house. "What? Were you scolded by Sis Ritsuko again? Geez, Aki is really hopeless, isn't he?" This boisterous character is Narumiya's other sister, Makoto. This careless-natured sister has always been blunt and mercilessly digs into her own emotional wounds. The item he has obtained is a hypnosis device. Will he be able to freely manipulate the noisy two sisters using the hypnosis device?