Beelzebub

Ishiyama High is a school populated entirely by delinquents where nonstop violence and lawlessness are the norm However there is one universally acknowledged ruledont cross first year student Tatsumi Oga Ishiyamas most vicious fighter
One day Oga is by a riverbed when he encounters a man floating down the river After being retrieved by Oga the man splits down the middle to reveal a baby which crawls onto Ogas back and immediately forms an attachment to him Though he doesnt know it yet this baby is named Kaiser de Emperana Beelzebub IV or Baby Beel for shortthe son of the Demon Lord
As if finding the future Lord of the Underworld isnt enough Oga is also confronted by Hildegard Beels demon maid Together they attempt to raise Baby Beelalthough surrounded by juvenile delinquents and demonic powers the two of them may be in for more of a challenge than they can imagine