Nora by Kazunari Kakei

Nora, an unruly demon, has defied his Dark Liege one too many times. For the sake of his "education," Nora is sent to live among mortals and enters a bond of servitude with cool-as-ice star student Kazuma Makkari. Kazuma is about to learn the ways of the underworld...and Nora will learn more from the "real world" than he ever thought possible!

This manga is a Shonen jump specialty and if you like action and humor it is one to check out!!