Aiming to become a detective like Oto, newcomer Akira Yugami became a detective. In the Criminal Division of Kamenoike Police Station, where he was assigned, there is a man who looks like a beast, Kameno Mantaro. Akira, who was taken a liking to by Mantaro, is swayed by Mantaro, and his unreasonable behavior only increases his distrust. Will Akira be able to know Mantaro's true face while investigating the case?