Lamia is a demon doctor who is very small. Her name is possibly an allusion to the mythological demon. Later in the series, she seeks Furuichi's help to find Lord En on Hilda's request. Furuichi suspects her of being a tsundere character. Lamia carries a pistol loaded with bullets containing demonic concoctions that can erase memories, force a person to do one's bidding or, in the case of Oga, trap him in a psychic loop. She is always accompanied by two small muumuu pets, one of which sits atop her head and often mimics her mood. Her age is unspecified, but her appearance is that of a pre-teen girl. Her mother is general Laymia of the 34th Pillar Squad.

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.

A side story to the main series Beelzebub