The undead sorcerer Ainz Ooal Gown, once known as Momonga, has embraced his role in this new world. Though it resembles his favorite virtual reality game Yggdrasil, it still retains many secrets that he hopes to solve by exercising his position as emperor of the Great Tomb of Nazarick. However, following the disastrous indoctrination of one of his subordinates, Ainz has grown concerned of the Slane Theocracy's imminent perils, as well as the likely presence of other former Yggdrasil players. Meanwhile, Albedo, Demiurge, and the rest of Ainz's devoted guardians prepare for the next stage of their campaign: Nazarick's first battle...