In modern society, humans and beastkin live together. Under the government's strict management, beastkin utilize their extraordinary physical abilities and senses to engage in highly specialized professions, serving as cogs in society's machine. However, there were also those who fell out of that machine and turned against society. Standing on the front lines against such individuals is the Special Case Response Division of the Metropolitan Police Department's Criminal Affairs Bureau, the "Special Division." There, "beastkin detectives" with exceptional intuition and "human detectives" who tame them and sometimes act as a brake form buddy pairs, taking on a variety of special crimes. —The office of this "Special Division" is not one of strict atmosphere... On the floor are string toys, scratching posts, a blanket covered in fur on a worn-out sofa, and a cat tower that no one knows who placed there.