Beelzebub

=== Beelzebub (べるぜバブ, Beruzebabu) is a 2011 Japanese anime television series based on Ryūhei Tamura's manga series of the same name. ... The series follows high school delinquent Tatsumi Oga, who is forced to raise Beelzebub, the son of the Devil King who was sent to earth to destroy humanity ===