"Overlord" is a popular light novel series written by Kugane Maruyama. It follows the story of Satoru Suzuki, a salaryman who finds himself trapped in a virtual reality game called Yggdrasil after it shuts down. He takes on the persona of his powerful character, Ainz Ooal Gown, the leader of the Great Tomb of Nazarick, and sets out to explore this new world while seeking to understand its rules and inhabitants. The series blends elements of fantasy, adventure, and strategy as Ainz interacts with various characters, including NPCs who gain sentience. As he navigates through challenges and conflicts, Ainz aims to establish his dominance and uncover the mysteries of the world, all while maintaining his identity as an overlord.