A Family day?
It's about this Delinquent, B....... (Not going to say that word :/) high school boy. Who one day found a man floating down a river and he pulled him out. Then Split him in half and found a Baby in him, but this is not an ordinary Baby.. This baby is a Baby Demon lord!. Oga (the high school boy) has to try and now find someone who is more stronger than he is to dump Baby Beel/Beelzebub on so he can grow up and destroy Humanity.