"Overlord" is a Japanese light novel series written by Kugane Maruyama. It follows the story of Momonga, a powerful player in a virtual reality game called Yggdrasil. When the game is shut down, he finds himself transported into a fantasy world, where he takes on the persona of his in-game character, Ainz Ooal Gown, a skeletal overlord. In this new world, Ainz seeks to understand his surroundings while establishing his dominance. He commands a group of loyal followers, including Albedo and Demiurge, as he navigates political intrigue and battles against various factions. The series explores themes of power, loyalty, and the nature of reality.