The story follows Iruma Suzuki, a 14-year-old human boy, who is sold to a demon by his parents. The demon, known as Sullivan, takes Iruma to the Demon World and officially adopts him as his grandson. He enrolls Iruma in the Babyls School for Demons where he is the headmaster and where Iruma quickly befriends the demons Alice Asmodeus and Clara Valac. However, Sullivan tells Iruma to never reveal that he is human since he will be eaten if anyone finds out. Iruma then vows to blend in during his time in the demon world, although he only stands out because of all the situations and adventures that arise.

Following the conclusion of the three-way organizational war, government bureaucrat Ango Sakaguchi recalls an event that transpired years ago, after the death of the former Port Mafia boss. Osamu Dazai, still a new recruit at the time, was tasked with investigating rumors related to a mysterious explosion that decimated part of the city years ago—and its connection to the alleged reappearance of the former boss. Due to circumstances out of his control, he is partnered with Chuuya Nakahara, the gifted yet impulsive leader of a rival clan known as the ''Sheep,'' to uncover the truth behind the case and shine a light on the myth of Arahabaki—the god of fire who might just lead Dazai to the case's solution. Meanwhile, in the present day, it is business as usual once again for the Armed Detective Agency. Their peaceful break will not last for long, however, as enemies old and new gather their strength and prepare for another face-off. [Written by MAL Rewrite]

Igarashi Futuba's new job would be great if her senpai, Takeda Harumi, wasn't so incredibly annoying! Futuba hates his laugh, she hates how big he is, and she really hates that he treats her like a little kid. Just because Futuba is short and looks young doesn't make her a kid, and just because she spends so much time with Takeda doesn't mean she sees him as anything but an annoying senpai...or does she?! (Source: Seven Seas Entertainment)

In a fantasy version of Europe, a war between enemy countries is brewing. One of these countries, Zhcted, has its seven regions ruled by War Maidens, known as Vanadis. Equipped with powerful dragon-carved weapons, Eleonora "Elen" Viltaria, one of the Vanadis, launches an invasion against their neighboring rival country of Brune. Eventually, Tigrevurmud "Tigre" Vorn, a young archer and an earl for Brune's region of Alsace, has his entire army decimated at Elen's hands. In a strange twist of events, Elen spares Tigre, and gives him the order, "Become mine!" What could be the meaning behind this new alliance? Adapted from the light novel written by Tsukasa Kawaguchi, Madan no Ou to Vanadis is an epic adventure filled with complex war tactics and beautiful women. Trapped in a multinational conflict, Tigre and Elen are swept up in a war filled with dark secrets, conspiracies, and corruption. [Written by MAL Rewrite]