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.
The beelzebub anime will end in april of this year. The tv ratings of the show have been constantly very good but the animation studio realized that they cant keep it ongoing like this. There are too many filler episodes for show with only about 55 episodes.
Well all know that naruto and bleach also have tons of fillers but the difference is that studio pierrot cared about these two personally while beelzebub seemed just to be another project to grow in popularity.