Nippon Ichi's 10 year anniversary project for Disgaea is called Disgaea D2: A Brighter Darkness, a sequel to Hour of Darkness. Check out the game's wacky trailer.
The Netherworld is a place of constant strife. After the events of Hour of Darkness, Laharl has become a full-fledged Overlord. Unfortunately, many of the denizens of the Netherworld still don't give him the respect he feels he deserves, so he sets out on a journey to achieve fame. Along the way, Laharl meets a girl who claims to be his sister and demons with grudges against him.
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You can visit The Netherworld yourself when Disgaea D2: A Brighter Darkness releases on October 8.