The Netherworld - a realm darker than the deepest abyss, located far beneath where mortals tread. It is a cursed land where evil reigns and foul beings dwell. Nobody knows its whereabouts, but everybody fears its existence.

The story takes place two years after the death of King Krichevskoy, the ruler of the Netherworld. His son Laharl awakens from a long sleep, unaware of his father's death. Meanwhile, scheming demons vie for supremacy over the Netherworld. With the help of his subordinate Etna and her underlings, the egocentric, self-absorbed Prince Laharl must fight to regain the throne and claim his birthright.