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Original Video Animation (OVA)

Tatsumi Oga arrives at Ishiyama High school with an electric emitting baby, whose origins he has trouble explaining to his friend, Takayuki Furuichi. They are then approached by a woman named Hildegarde who explains that the baby, Kaiser de Emperana Beelzebub IV, is the son of a demon lord and Oga has been chosen to raise it to destroy humanity. After initially being chased after by Hildegarde after refusing to take of Beelzebub, Oga learns that if he can find someone more ruthless than he is, he can get rid of him. Oga seeks out one of Ishiyama's toughest delinquents, Hajime Kanzaki, easily beating his henchman, Shiroyama. When Kanzaki asks Oga to throw Shiroyama out of the window, Oga determines from Beelzebub's reaction that Kanzaki is not suited and knocks him out the window instead. That evening, Hildegarde arranges to stay at Oga's house, mentioning Beelzebub cannot go further than 15 meters away from him. The next day, another one of Ishiyama's feared leaders, Aoi Kunieda, arrives with her gang to face against Oga, though she recognizes him as someone who helped her at the park while she was in disguise taking care of her brother. After dodging her powerful attacks, Oga asks Aoi to be Beelzebub's mother, which just makes her embarrassed. Later, another leader, Tatsuya Himekawa, arranges for Takayuki, Hildegarde and Beelzebub to be kidnapped. Oga manages to catch up with the help of the transdimensional demon, Aldelaion, before utilizing Beelzebub's power to beat Himekawa. The OVA ends with Oga confronting the final leader, Hidetora Tōjō. 

Episode 1 : I Picked Up The Demon King

Tatsumi Oga, a delinquent student at the worst high school in Japan, arrives at school with a small baby who emits massive shocks of electricity whenever it cries. Oga claims he found after splitting open a strange man who came floating along the river, though his friend Takayuki Furuichi does not quite believe. While at Takayuki's house, they are both approached by a demon woman named Hildegarde who claims the baby, known as Kaiser de Emperana Beelzebub IV, is the son of Devil King who was sent to Earth to find a human to raise him so he could destroy humanity. When attempts to retrieve Beelzebub fails, Hildegarde notes that Oga has been chosen for the job. When Oga refuses, Hildegarde attempts to kill him with a bird demon but Oga manages to beat it. When he is cornered by Hildegarde and a bunch of thugs and his cheek is cut, Beelzebub goes into a tantrum that only Oga is able to stop. When a damaged pylon nearly falls on Beelzebub, Oga steps in to save him and resonates with Beelzebub's power, allowing him to disintegrate the pylon. After Oga recovers from the ordeal, Hildegarde decides to stay with him to raise Beelzebub, much to Oga's chagrin. 

Episode 2 : I Became A Gang Leader With A Child

Hildegarde presents herself to Oga's family in the wrong way, giving them a different view of the situation. She also informs Oga that if he is more than 15 meters away from Beelzebub, his cries may destroy the city. While dealing with this situation, Oga comes up with the idea that if he can find someone stronger and more ruthless than he is he can dump Beelzebub on him and be free.