Disgaaea: Hour of Darkness

The story of Disgaea opens with Laharl rising out of an open coffin in his room. Etna, one of the castle vassals, is standing next to him, surrounded by various weapons. She explains that he has been sleeping for two years, far longer than he intended, and his father, King Krichevskoy, has died. Laharl vows to reclaim the throne, and, after consulting with Etna and his other vassals, goes to Vyers' castle.

After defeating the demon Vyers, who refers to himself as the "Dark Adonis" and is renamed "Mid-Boss" by Laharl, he meets Angel Trainee Flonne. Flonne had been sent to the Netherworld by Seraph Lamington, the ruler of Celestia, to assassinate King Krichevskoy (who was already dead). Shocked by Laharl's lack of grief at his father's death, the eternally optimistic Flonne joins Laharl's party to determine if demons are capable of feeling love. Observing them in secret is the paranoid Archangel Vulcanus, who interprets Flonne's actions as treason and is convinced that she is plotting against him.

After Etna demands that Laharl pay the salary of the Prinnies that she has hired, he decides to attack the demon with the most money in the vicinity. This is Hoggmeiser at Dinero Palace. After defeating Hoggmeiser, Laharl is about to kill him, until Hoggmeiser's son rushes out and gets in the way. Flonne convinces Laharl to spare them, and Laharl lets them keep some of the money. In response to this act, Hoggmeiser joins the party.

At one point, Flonne and Etna discover a photograph of Laharl in an embarrassing situation. Laharl refers to this as a "paparazzi shot", however, the actual contents of the photo are never actually revealed. A threat on the back of the photograph states that copies of it would be distributed if Laharl did not accept a challenge to fight for the overlordship; thus Laharl was blackmailed.

Responding to this challenge, Laharl meets Maderas, a vampire. He was banished by King Krichevskoy, for stealing the King's favorite snack, black pretzels. Maderas takes advantage of Laharl's two biggest weaknesses – optimism and women with sexy bodies. Maderas was also controlling Etna by holding her memory. He had instructed her to kill the prince, but she had put him to sleep for two years by poisoning him instead. Etna eventually betrays Maderas, and along with Laharl, Flonne, and Mid-Boss, defeats him.

Waking up later at night, Flonne discovers that several Prinnies are chanting and leaving the castle. Laharl, worried that his reputation will be tarnished if it is discovered that he let his vassals escape, chases after them the next morning. Eventually, he runs into Death, and the player learns that Big Sis Prinny is actually Laharl's mother; she became a Prinny because she gave her life to save him.

After Laharl becomes the undisputed Overlord of the Netherworld, he meets a group of humans from Earth: Captain Gordon, Defender of Earth; Jennifer, his assistant; and the robot Thursday. Gordon has been led to believe that his mission is to assassinate Laharl due to an impending attack on Earth by the Netherworld. Laharl promises not to invade Earth if Gordon defeats him, on the condition that Gordon becomes one of his vassals if he wins; Gordon is embarrassed by his ensuing loss and servitude. After the Earth Defense Force appears in the Netherworld, it is revealed that Gordon was actually sent to secure a path for an invasion of the Netherworld by the humans, who had been tricked by Vulcanus.

General Carter sends Kurtis to the Netherworld, and eventually goes there himself on the Space Battleship Gargantua. Kurtis abducts Jennifer, and Laharl engages the EDF fleet of spaceships in a rescue attempt, destroying all but the Gargantua by himself. When Laharl and his party arrive at the Gargantua's bridge, several angels from Celestia appear and attack them. After being defeated, General Carter escapes, only to have Mid-Boss appear to give him a message.

In response to this turn of events, Flonne and the rest of the party decide to go to Celestia to confront the Seraph. Vulcanus goes to Seraph Lamington, declares that Flonne is a traitor who is leading an army of demons in an invasion of Celestia, and goes to lead a group of angels to repel this "invasion". Vulcanus reveals to Laharl and his party that he intends to conquer all three worlds and rule over them as a god. After defeating Vulcanus, Laharl finally meets the Seraph and Flonne explains Vulcanus' plan and what she has learnt while travelling with Laharl. The Seraph accepts her version of events and agrees that demons are, in fact, capable of feeling love. However, he declares that Flonne must be punished because she fought against other angels, and turns her into a flower. Outraged at this injustice, Laharl attacks the Seraph, initiating the game's final battle.

The game has multiple endings. Depending on the way the game was played up to this point, the Seraph may or may not survive, Flonne either remains a flower, is restored to her original form, or is transformed into a Fallen Angel, and Laharl either becomes a great Overlord, disappears and leaves Etna in charge of the Netherworld, or dies and becomes a Prinny. It may also be noted that, on the Good Ending, when the spirit of Laharl's mother appears to him, Vyers appears to already know her, and the way he talks to Laharl suggests that he is King Krichevskoy.