Overlord is a popular anime series based on the light novel of the same name written by Kugane Maruyama. The story follows Momonga, a powerful player in a virtual reality game called Yggdrasil, who finds himself trapped in the game after it shuts down. Instead of logging out, he becomes his character, the undead overlord Ainz Ooal Gown, and sets out to explore this new world. As Ainz, he aims to discover the fate of the game and its inhabitants while asserting his dominance over the world. The series features themes of power, loyalty, and the complexities of leadership, as Ainz interacts with various characters, including his loyal guardians and other factions in the realm.