Koma is a demon of the Shicarion Family, which moved to the human world long ago. His people are called purifying gods and have statues dedicated to them at shrines. Koma is very perverted and will ask girls their three sizes, he even asked Aoi for her panties in exchange for his assistance. Even when he is in battle he will say lecherous remarks about any girl in the vicinity. He is constantly teasing Aoi which usually earns him a harsh beating from her. He believes if he were to be killed by a cute girl, that would be the ideal way to go.   (Source: Beelzebub.wikia)

Oga Tatsumi is a first year student in Ishiyama High, a notorious school for delinquents. One day he sees a man floating by, and the man suddenly splits in half to reveal a baby boy inside! 
(Source: Crunchyroll)

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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.
 
Note: Includes 12 extra chapters.