Angel-trainee Flonne awakens Laharl, the son of the late Lord Krichevskoy, from a two-year nap by mistake. Cranky and hungry, Laharl snubs the winged nuisance and sets out to claim his place as the new overlord of the Netherworld.

Laharl and his two new vassals get some rest in a museum full of Netherworld artifacts.

A showdown with a demon slayer is Laharls only escape from a dungeon.