* Based on a manga by Tamura Ryuuhei, serialised in Shounen Jump.

Oga Tatsumi, the strongest juvenile delinquent, is a first year at Ishiyama High, the school for delinquents. He tells the story of how he found baby Beelbou to his best (and only) friend Furuichi Takayuki: One day while fishing by the river (actually, taking revenge on people trying to kill him in his sleep), he sees Alaindelon floating down it, he pulls him to shore and the man splits in half revealing a baby boy. This boy is the son of none other than the demon king Daimaou and Oga has been chosen as the one to raise it with the help of the baby's maid Hilda.

Since Oga can no longer part with Baby Beel — without almost dying — they visit the delinquent school together from then on. An inconvenience, that Oga attempts to 'pass on' to other students at Ishiyama — the theory is that if Oga can find someone more evil and stronger than himself, Baby Beel will 'attach' to that person instead. After subsequently fighting and defeating all members of the Touhoushinki and in the process, destroying Ishiyama High itself, Oga and company are transferred to Saint Ishiyama Academy, a carefully monitored school that does not have any delinquents, yet...

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Alternative version: Beelzebub: Hirotta Akachan wa Daimaou!?