Beelzebub

Ishiyama High is filled with delinquents, yet everyone knows one rule: do not pick a fight with Tatsumi Oga. One day Oga finds a bizarre baby who immediately attaches himself to him, followed by a demon maid named Hilda carrying terrible news. The child is Beel, son of the Demon Lord, and Oga has been chosen as the human parent who will raise him until he is ready to destroy the world. Oga tries to escape the responsibility by finding someone even more wicked who might take the baby instead, but Beel only grows more attached while demonic power and constant fights drag them into fresh trouble. The school's toughest delinquent has unwillingly become father to a potential apocalypse.