Disgaea (2006)
Plot
Prince Laharl is awakened after 2 years of sleep by an Angel, Flonne, who was ordered to assassinate him but fails. Both discover Laharl's father passed away. They're later joined by Etna, Laharl's Vassal. The three heroes travel through the Netherworld to help Laharl to succeed his father by becoming the new Overlord.
Where to watch Disgaea?
Disgaea is an anime show.
Disgaea is currently streaming for free (ad-supported) on Crunchyroll and it's also available on Crunchyroll, Crunchyroll Amazon Channel and Funimation Now.