Oga&#039;s older sister and the first leader of the Red Tails. A young adult now, she is nevertheless still violent and scares even Oga and Furuichi, but seems to get along with Hilda very well. As Oga&#039;s parents, she seems easily to accept the strange events happening around her brother ever since Hilda and Baby Beel arrived, even when blatantly supernatural beings like Forkas appear (she is seen being massaged by him in chapter 38). She is under the assumption that Hilda, Beel and the others are from Macao (apparently having mistaken it for Makai, the Japanese word for the demons&#039; dwelling).

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.

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: Wikipedia)

A side story to the main series Beelzebub

Misaki Oga