Disgaea 4 Complete retells the story of Lord Valvatorez, a former tyrant who fell from grace after making a promise to not drink blood. He was sent down to the deepest part of the Netherworld, known as Hades, to train Prinnies. When the powers that be decide to exterminate all of the Prinnies and take his away, Valvatorez leads a rebellion to get them back so he can fulfill a promise he made to them.