It has been 10 years since the war between the Iga and Kouga ninja clans came to an end. The two groups have since made peace, supposedly dispelling the animosity that once existed between them. Hachirou Kouga and Hibiki Iga, the successors of their respective bloodlines, seem to have the perfect conditions for their love to bloom, but not everyone is satisfied with the results of the age-old battle. Different tales of the final showdown between Gennosuke Kouga and Oboro Iga have spread, leaving Tadanaga Tokugawa—whom the Kouga represented—dissatisfied. As tension between the two clans rises once again, the brewing political climate threatens to keep the two fated lovers apart, just as it had in the previous generation. [Written by MAL Rewrite]

With great advancements in technology, mankind has created hIEs, human-like robots that act as public and personal servants for society. Unlike many others, the kind-hearted high school student Arato Endou treats hIEs as equals, but his financial situation keeps him from ever owning one. However, his normal life is shattered when an ordinary run to the local grocery store goes horribly awry. Viciously assaulted by a hacked hIE, Arato is on the verge of death; but luckily, he is saved by an abnormal hIE carrying a weaponized coffin. Her name is Lacia, one of five highly advanced hIEs that recently escaped the clutches of the mysterious MemeFrame Corporation. Faced with a hacked car threatening to run them over, Lacia offers Arato a deal: in exchange for saving his life, he must register as her new owner, thus taking full responsibility for her actions. With little choice, he decides to trust this artificial girl and allows her to live in his home. Though Lacia begins to adapt to her new, peaceful lifestyle, she warns the entranced Arato of one thing—she does not have a soul. [Written by MAL Rewrite]

Arato Endou and his faithful hIE, Lacia, have come together once again to show the world that artificial intelligence, no matter how brilliant, can be shut down safely. As they descend into the holding facility to confront Higgins, Lacia's AI creator, the pair must fend off enemies from all fronts. Among them are Snowdrop, a rampant hIE hellbent on devouring Higgins, and Methode, a hIE who seeks vengeance against Lacia. The world's super-intelligent AIs unanimously decide to terminate Lacia, whom they deem a threat to humanity. With limited time and the odds stacked against them, will Arato and Lacia be able to truly join together in a society where humans and hIEs can coexist peacefully? [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]