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It is the dark century and the people are suffering under the rule of the devil, Vandel, who is able to manipulate monsters. The Vandel Busters are a group of people who hunt these devils, and among them, the Zenon Squad is known to be the strongest busters on the continent. A young boy, Beet, dreams of joining the Zenon Squad. However, one day, as a result of Beet's fault, the Zenon squad was defeated by the devil, Beltose. The five dying busters sacrificed their life power into their five weapons, Saiga. After giving their weapons to Beet, they passed away. Years have passed since then and the young Vandel Buster, Beet, begins his adventure to carry out the Zenon Squad's will to put an end to the dark century.

The delinquents of Ishiyama High School either fear Tatsumi Oga or wish to defeat him, but the young fighter finds himself preoccupied with other matters—like tending to baby Kaiser de Emperana "Beel" Beelzebub IV, the son of the Demon Lord. Baby Beel's maid, Hildegard "Hilda," informs Oga that the infant has latched onto him due to the former's immense strength. In turn, Oga must take responsibility and raise the Demon Lord's son, or face Hilda's blade—that is, unless he can find someone stronger than him to appeal to Beel. Perhaps Oga can convince one of the Tohoshinki, composed of the four strongest fighters of Ishiyama High, to take Beel off his hands! [Written by MAL Rewrite]

Ishiyama High is a school populated entirely by delinquents, where nonstop violence and lawlessness are the norm. However, there is one universally acknowledged rule—don't cross first year student Tatsumi Oga, Ishiyama's 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 Oga's back and immediately forms an attachment to him. Though he doesn't know it yet, this baby is named Kaiser de Emperana Beelzebub IV, or "Baby Beel" for short—the son of the Demon Lord! As if finding the future Lord of the Underworld isn't enough, Oga is also confronted by Hildegard, Beel's demon maid. Together they attempt to raise Baby Beel—although surrounded by juvenile delinquents and demonic powers, the two of them may be in for more of a challenge than they can imagine. [Written by MAL Rewrite]

According to legend, Beelzebub, one of the seven princes of Hell, betrayed God and was banished from Heaven for eternity. Beelzebub now leads the kingdom of Pandemonium, where all former angels roam and work every single day of their immortal lives. A devil like him would give people chills at the mere mention of his name, but… What if Beelzebub is not as evil as initially thought? What if he was obsessed with fluffy things? And what if Beelzebub is actually a woman? That is what new assistant Myurin discovers when he is hired to serve Her Majesty Beelzebub. She may know exactly what to do to keep Pandemonium running like clockwork, but whenever she leaves the professionalism of the office, the girl needs some assistance in order to function like a normal…devil. As much as Myurin can’t stand being unprofessional, he is secretly obsessed with her adorable antics, and his new job teaches him that everything is not exactly what it seems, especially with the other head devils of Pandemonium. [Written by MAL Rewrite]