4 Yokais are sent to the Human Realm to apprehend demons and send them back to Hell: Enma, a Fire-demon who leads the team; his partner Yukihime, an Ice-demon with a cold personality; Kapaeru, a kappa who gathers intel on escaped demons; and Grandpa Chapeauji, an ancient, wise demon that takes the disguise of Enma's hat. Together, they form Enma Detective Agency to solve mysterious, gruesome murders committed by demons without raising human suspicion.