Disgaea 2

So... you wake up one day after a two-year nap and discover that your father is dead. What do you do? Take over his kingdom and rule with an iron fist, of course! Laharl may be new to the whole Overlord scene, but with the help of the demon-girl Etna and the angel-ditz Flonne, hefs going to be the best ruler the Netherworldfs ever seen. All he has to do is get by the hordes of halfwit hellions determined to challenge him for the throne, foil an interdimensional plot and keep his own vassals from trying to kill him. Sound rough? Hell yeah. (Source: Broccoli Books)

The Netherworld, a world spoiled by spite, cruelty, blood-soaked taboos, and boundless riffraff. They say that dark dwellers run rampant, causing horrifying disasters in these lands. In the center of this Netherworld lies a school that endlessly continues to expand its grounds -- Nether Institute, Evil Academy. With the Overlord as dean and greater demons for teachers, demon students who follow their baser instincts are labeled as honor students at this school of torment. Mao, the Overlord's son, in order to defeat his father, decided to have the power of a hero. Involving the delinquent Raspberry and her sidekicks together with the 'hero' Almaz, another chaos started in the darkness of the Netherworld!