In the aftermath of a catastrophic event, Ainz Ooal Gown, the once-human sorcerer now known as Momonga, navigates his existence in a world reminiscent of the virtual realm he cherished, Yggdrasil. Determined to unravel its enigmas, he harnesses his authority as ruler of the Great Tomb of Nazarick. However, a troubling incident involving the manipulation of one of his followers prompts Ainz to brace himself against the looming threats posed by the Slane Theocracy and the potential presence of other former Yggdrasil participants. Meanwhile, Albedo, Demiurge, and the loyal guardians of Ainz embark on preparations for Nazarick's inaugural military campaign. Overlord II seamlessly continues the saga of Ainz Ooal Gown, his diverse cohort of anti-human sentinels, and the unsuspecting populace caught in the wake of the Overlord's emergence.