Akuma-kun

Dr. Faust foresees a new age of demons spreading across the human world, but age leaves him unable to confront the danger himself. He discovers that young Shingo Yamada bears the mark of a chosen demon fighter and entrusts the boy with the task of opposing the supernatural forces ahead.

To give Shingo a fighting chance, Faust summons Mephisto II, a devil with little enthusiasm for becoming humanity's ally. Bound together by a pact, the unlikely pair faces demons and occult threats while Shingo grows into the role that destiny has placed upon him.