As the final hour of the virtual reality game *Yggdrasil* arrives, Momonga, a powerful wizard and leader of the dark guild Ainz Ooal Gown, decides to stay in the game until its servers shut down. However, when the clock strikes midnight, he discovers he's still fully conscious, and to his shock, the non-player characters have developed personalities. Facing this bizarre reality, Momonga commands his loyal servants to help him investigate and take control of this new world. Determined to understand what’s happening, he seeks to uncover the cause and whether anyone else is trapped in this strange situation.