In modern society, humans and beastkin live together. Under the strict management of the government, beastkin utilize their extraordinary physical abilities and senses to engage in highly specialized professions, serving as cogs in society. However, there were also those who fell out of line and rebelled against society. Standing on the front lines against them is the Special Cases Response Unit of the Metropolitan Police Department's Criminal Affairs Bureau, the "Special Unit." There, "beastkin detectives" with extraordinary intuition and "human detectives" who tame them and sometimes act as a brake form buddy pairs, taking on various special crimes. —The office of the "Special Unit" here is not a 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.