A supernatural ability awakened through committing a crime — known as a “Sin.” As vicious crimes empowered by these “Sins” spread throughout society, detective Ren Hizuki of the Tokyo Metropolitan Police’s First Investigation Division wages a relentless battle day after day. One day, she is reassigned to the newly formed Special Task Force for Supernatural Crimes — Public Security Division 9. There, she meets a timid and seemingly cowardly detective named Yūshirō Oboro. As they begin investigating cases involving supernatural abilities together, dark truths about Division 9 begin to surface — and so does the shocking secret behind Oboro’s true identity...!?