What is disgaea about?

um...disgaea is about an angel named flonne who meets a demon named laharl,and they go on a quest for something...i don't know much,i've only watched 4 or 5 episodes...oh.i almost forgot to mention etna.

Disgaea is about prince Laharl who wakes up after a 2 year sleep and during that time his father the Overlord died and their has been a power strugle in the neither world since. Prince Laharl goes on a quest to become the next Overlord with the help of his vassle Etna and eventually Flonne. They meet Flonne who has come from Celiastia (heaven) to assinate the Overlord only to find out that he died 2 years ago. She teams up with Laharl because she feels that all demons have love in their heart. You also meet some other characters along the way like Mid boss, the 37th DOE (Defender Of Earth) and some prinnies. And that is what Disgaea is about. (Be warned this is mostly from the game the anime still keeps some what to the original story line)