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.

[Source: Wiki]