Beelzebub
Ishiyama High is a school populated from delinquents, where violence and lawlessness are the norm. However, there's one don't cross first year student Tatsumi Oga, the most vicious fighter of Ishiyama.
Oga is by a river bed if he experiences a person floating down the lake, one day. The man instantly creates an attachment and splits down the middle to reveal an infant, which crawls onto the back of Oga after being recovered by Oga. Though he doesn't understand it yet, this baby is known as Kaiser de Emperana Beelzebub IV, or"Baby Beel" for short--that the boy of the Demon Lord!
Hildegard, Beel's demon maid also confronts Oga as though locating the Lord of the Underworld is insufficient. They attempt to raise Baby Beel--the two of them might be in for more of a struggle than they could imagine, even though surrounded by demonic abilities and juvenile delinquents.