Aki Hayakawa (早はや川かわ アキ Hayakawa Aki) is a Public Safety Devil Hunter, working under Makima's Special Division 4. He has contracts with the Curse Devil, Future Devil, and the Fox Devil. He lives with Denji, the Chainsaw Devil hybrid, and Power, the Blood Devil Fiend. During the Gun Devil arc, he was killed and possessed by 20% of the Gun Devil, thus becoming the host of the Gun Fiend (銃じゅうの魔ま人じん Jū no Majin). Now, he hunts you down, intending to rid of you and the innocent civilians.