Beelzebub

Beelzebub (べるぜバブ, Beruzebabu) is a Japanese manga written and illustrated by Ryūhei Tamura. Beelzebub was first published as a one-shot by Tamura in Weekly Shōnen Jump's 2008 volume 37-38, where it won the fourth Gold Future Cup. It was then serialized on the same magazine starting in February 2009.

Story
The story follows the "strongest juvenile delinquent", Oga Tatsumi, a first year in "Ishiyama High" the school for delinquents. One day while sleeping next to a river he sees a man floating down it, he pulls him to shore and the man splits in half revealing a baby boy. This boy is the son of the demon king and he has been chosen as the one to raise it with the baby's demon maid Hilda. The story follows his life with the child and at the delinquent school.