Did You Know?
The main character, Prier, is actually a hidden character in Disgaea (though the name was misinterpreted as "Priere"). Complete the area "Alternate Netherworld" to recruit her, but make sure that you have passed the proposal at the Dark Congress to open the portal to that area (and be at the final episode, of course). See more
Followed by Disgaea 2: Cursed Memories