As the virtual realm of Yggdrasil faces its final moments, Momonga, a formidable sorcerer leading the dark guild Ainz Ooal Gown, opts to stay online as the servers wind down. Surprisingly, past the game's supposed end, Momonga remains fully aware, and the once-programmed characters now exhibit individuality. Faced with this unprecedented event, Momonga rallies his devoted followers to explore this transformed land, aiming to unravel the mystery behind this anomaly and searching for fellow players who share his surreal fate.