Gehenna Gate - A demon that can be created when Satan appears in the material world (Assiah). Has the ability to go back and forth between Assiah and Gehenna.
English (dubbed) title : Gehenna Gate.
Astaroth (King of Rot). Possessed Reiji Shiratori, leader of the delinquent gang, and as Satan's minion, comes to escort Rin back to Gehenna.
Malkin - A familiar summoned by Nagatomo. Known as the "Bountiful Guardian Spirit." Uses a spade and fangs to fight. It may be female.
Coal Tar - Demons who possess fungi and are airborne. Associated with rotting. Though they are at the bottom of the demon food chain, they also far outnumber any other species, and become an instant threat once they band together as one.