Fifteen years ago, disaster struck human civilization, and now dangerous man-eating monsters roam the ravaged lands, posing an existential threat to the remaining survivors. Amid this turmoil, an isolated facility shelters children and nurtures them in peace. However, as a few among them find out about the world beyond the narrow periphery of their nursery's walls, their curiosity about it slowly grows. Meanwhile, in the outside world, young survivors Maru and Kiruko band together to search for a special place called Heaven, each for their own reasons. Carrying past burdens and tragic secrets, the two hope to find answers to the cruelty they have experienced in their lives and in the world, which still remains in tatters.

After his father's death and the destruction of his village at the hands of English raiders, Einar wishes for a peaceful life with his family on their newly rebuilt farms. However, fate has other plans: his village is invaded once again. Einar watches helplessly as the marauding Danes burn his lands and slaughter his family. The invaders capture Einar and take him back to Denmark as a slave. Einar clings to his mother's final words to survive. He is purchased by Ketil, a kind slave owner and landlord who promises that Einar can regain his freedom in return for working in the fields. Soon, Einar encounters his new partner in farm cultivation—Thorfinn, a dejected and melancholic slave. As Einar and Thorfinn work together toward their freedom, they are haunted by both sins of the past and the ploys of the present. Yet they carry on, grasping for a glimmer of hope, redemption, and peace in a world that is nothing but unjust and unforgiving.

Striking fear into the hearts of mortals, the Demon Lord Satan begins to conquer the land of Ente Isla with his vast demon armies. However, while embarking on this brutal quest to take over the continent, his efforts are foiled by the hero Emilia, forcing Satan to make his swift retreat through a dimensional portal only to land in the human world. Along with his loyal general Alsiel, the demon finds himself stranded in modern-day Tokyo and vows to return and complete his subjugation of Ente Isla—that is, if they can find a way back! Powerless in a world without magic, Satan assumes the guise of a human named Sadao Maou and begins working at MgRonald's—a local fast-food restaurant—to make ends meet. He soon realizes that his goal of conquering Ente Isla is just not enough as he grows determined to climb the corporate ladder and become the ruler of Earth, one satisfied customer at a time! Whether it's part-time work, household chores, or simply trying to pay the rent on time, Hataraku Maou-sama! presents a hilarious view of the most mundane aspects of everyday life, all through the eyes of a hapless demon lord. [Written by MAL Rewrite]

With the ambitious Ryuusui Nanami on board, Senkuu Ishigami and his team are almost ready to sail the seas and reach the other side of the world—where the bizarre green light that petrified humanity originated. Thanks to the revival of a skillful chef, enough food is being prepared for the entire crew, and the incredible reinvention of the GPS promises to ensure safety on the open sea. Preparations for the upcoming journey progress swimmingly until Senkuu receives an eerie message from a mysterious source. More driven than ever, the scientist sets out to explore the new world and discover what it can offer for his scientific cause. Though the uncharted territories may hide unkind surprises, Senkuu, with a little help from science, is ready to take on any challenge.