Nippon Ichi has also licensed or produced a wide variety of Disgaea merchandise, including a manga. In 2006, Nippon Ichi released a sequel called Disgaea 2: Cursed Memories for the PlayStation 2, as well as a 12 episode long anime titled Makai Senki Disgaea. A North American version of Disgaea for the Playstation Portable was released on October 30, 2007 dubbed Disgaea: Afternoon of Darkness. The handheld version of game was released on November 30, 2006 in Japan. A second sequel, Disgaea 3: Absence of Justice, was released for the PlayStation 3 on August 26, 2008.
Humanoid characters may lift and throw other units across the map in order to allow allies to move further or force enemies to keep their distance. This even allows the player to capture enemies by throwing them into the base panel; these enemies then become allies, and can be used on subsequent maps. The chance of capturing an enemy in this manner depends on several factors. Failure to capture the enemy will result in the death of all characters inside the base panel, and the enemy will survive.
Disgaea has only one pair of stores where items may be purchased, consisting of an armor shop and a weapon shop within Laharl's castle. These shops are described in-game as the Netherworld branch of the Rosen Queen Co. The overall quality and types of the items sold in these shops can be changed through proposals to the Dark Assembly. A hospital where characters may be healed in exchange for payment is also present in the same area of the castle and rewards Laharl and company by giving them items when they pay specific amounts of money for treatment.
The proposals available to place before the senate depend on the number of promotion examinations completed by a character; these examinations consist of a battle between a handful of monsters and a single character on the floor of the Assembly. Each proposal to the Dark Assembly costs "mana", which is built over time by individual characters as they defeat enemies in combat. The amount of mana gained depends on the enemy's level.
Each floor has a gate, a special map square that can be used to go to the next level in the Item World. However, a monster with the unique class "Gate Keeper" will sometimes block the gate. The Gate Keeper must be defeated or forced to move to use the gate and progress through the Item World. As many items contain stronger monsters than are ever found outside the Item World, the Item World is often the only way to acquire rare and powerful weapons.
Every ten levels has an item boss. The strongest of each type of weapon and the three ultimate items each contain an Item God 2. Defeating these bosses also increases the attributes of the item. The Item World can only be exited at the end of every tenth level containing an Item Boss, or at any other time by using an item called 'Mr. Gency's Exit', a play on the phrase "Emergency Exit".
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: 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.
Souhei Niikawa and Yoshitsuna Kobayashi, the game's producer and main programmer, have explained the intended humor of Disgaea; they give the example of Captain Gordon being a satire of American comic book characters. Episodes of the game are separated by previews, parodying such previews at the end of anime series episodes. Most of these have voice-overs by Etna and do not accurately reflect the plot of the next episode; one of the characters calls these previews Etna's fantasies. The game is also filled with Prinnies, penguin-like creatures that explode when thrown. More information on their origins is revealed as the game progresses – they contain human souls and labor in the Netherworld and Celestia to atone for their sins. Character designer Takehito Harada described the prinny design as becoming less realistic as development continued.
The makers of Disgaea have responded that characters represented by 3-D models in other games are often limited by a "set pattern of motions", and they were able to make the characters of Disgaea more expressive with sprites.
There were two different styles of boxart for the American release.
A port for the PlayStation Portable named Disgaea Portable was released in Japan on November 30, 2006. It was later released in the United States on October 30,2007 under the name Disgaea: Afternoon of Darkness.
Afternoon of Darkness features extras over the original, such as a 16:9 format to take advantage of the PSP's widescreen display. There is also a mode that focuses on Etna as the main character. In Etna Mode, Etna kills Laharl by accident while trying to wake him in the beginning of the game and thus becomes the main character. There are some extra boss battles such as Overlord Zetta from Makai Kingdom and Rozalin and Adell from Disgaea 2. There is, for the first time, a multiplayer mode available through Ad-hoc connections. This features multiple modes such as a "Defeat the Leader," "Capture the Flag," and the original "Battle." In the Multiplayer mode, each player also has access to "Geocubes" which give different effects to the battlefield. Other new additions include a music shop, which allows the player to listen to the game's various songs and even change the Item World theme, and a record keeper, which keeps track of various bits of information such as ally kills and obtained items.
In addition, Afternoon of Darkness includes a complete dual language option and the option to turn off battle animations. Most of the silent Japanese cut scenes now include voice acting. However, when set to English, the scenes that were originally silent in the PS2 release are still silent. To reflect Etna's recent voice actor change, her lines have been re-recorded to match Michelle Ruff's portrayal of Etna in Disgaea 2 and the anime. One notable omission is the theme song "The Invasion from Within" by Tsunami Bomb. As Atlus was the publisher of the original PS2 version and arranged for the licensing of the song, and NIS America (Nippon Ichi's American branch) published the PSP port themselves, they did not retain the rights to use the song and did not renegotiate for them. Also missing is the song "One With the Stars" which, like "The Invasion from Within", was added in the original PS2 release by Atlus.
On March 5, Weekly Famitsu stated that there had been an official announcement for for the Nintendo DS.
On March 7, NIS America released a statement on the US release of a new edition of Disgaea: Hour of Darkness for the Nintendo DS. The game will be a port of the PSP version, and will include multiplayer gameplay and Etna mode. In order to fully utilize the Nintendo DS' capabilities, several key improvements will be made to the user interface and game system.
The Nintendo DS version contains the following features:
Disgaea DS was released in North America on September 23, 2008, through distributor NIS America.