Nora: The Last Chronicle of Devildom Vol. 2 (manga)

The Rage Ignites

Nora's presence on Earth has made him a target for renegade demons. But when he uses magic to fight them, it takes a toll on Kazuma's body! The Dark Liege sends Kazuma a ring to counteract this effect, but what Kazuma really needs is information on the legend of Cerberus, Nora's true form. Too bad the one with the info is one of the demons he's fighting!