Yggdrasil is a virtual reality game known for the freedom it grants its players. Following a brief tutorial, users are free to explore the world and customize everything, from their classes to their weapons. However, in the year 2138, the game reaches its final hours as its servers shut down at midnight. Momonga, a dedicated player of Yggdrasil, chooses to spend the game's last moments within his guild, Ainz Ooal Gown. Oddly, at the stroke of midnight, the game does not log him out. Instead, Momonga finds himself transported to another world, one that appears identical to that of Yggdrasil. Confronted with this already abnormal situation, he discovers that the NPCs have gained sentience. Trapped in his avatar's skeletal body and desperate to uncover the cause of his predicament and find other players like him, Momonga sets out to take control of the new world with the help of his loyal subjects.