Disgaea: Afternoon of Darkness' insides are just as quirky as its packaging. You take the role of Laharl, a young demon prince who has just awoken from a two-year nap to discover that his father is dead and the Netherworld is in chaos. This initially sets him out on a quest to regain his place as king of the Netherworld, but along the way, he'll have to deal with obstacles such as a labor dispute, an empty-headed angel, a backstabbing servant and other unique challenges.
New to the PSP version is an alternate campaign featuring the above-mentioned backstabbing servant, Etna. In this version of the story, Etna accidentally kills Laharl while trying to wake him up. At first, she decides to try and cover everything up by dressing one of her Prinny servants as the dead prince, though she eventually decides to make a run from the Netherworld's top spot.
For the most part, the game plays almost like your standard tactical RPG. You start off with a small army, mostly made up of the main characters and Prinnies. The board layout is standard, but the gameplay is actually rather unique. You begin a battle with none of your characters on the field, only a blue portal. You click on the portal to see your army and summon members into battle. At any time during the battle (unless under special circumstances), you can bring a soldier back into the portal and deploy new ones. Some battles have limited the number of characters allowed on the field at one time, adding to the game's strategic element.
Army creation is very well done and is very deep. When you want to make a new soldier, you have to go to the Dark Assembly, which serves as the Senate for the Netherworld. You can then petition to make a new soldier out of the available classes. You can choose to make humanoid classes (fighter, cleric, mage, etc.) or Monster classes (ghoul, ghost, demon, dragon, etc.). Once you select the type of soldier you want to make, you have to spend Mana (which you get from defeating enemies) to create their "Competency Level," which determines any bonuses or stats of the class. These range from "Good-for-nothing" to "Expert." If you want to make the really competent soldiers, you have to get permission from the Dark Assembly. Depending on who is requesting the soldier (anyone in your army can), the new soldier will become their apprentice, which helps determine stats, abilities and other things. As things progress, you can eventually learn to combine classes opening up a mind-boggling 150 classes/combos for use in the game.
Politics is a big part of raising your army, gaining money, weapons. In addition to providing you with troops, the Dark Assembly also deals with giving you extra money, building new classes and getting better weapons. Each petition has a set "Pass" number, which determines how many "Yes" or "No" votes you need. You can bribe senators to vote for you, or you can use force and challenge them to a fight. Both have downsides. If you bribe someone and they don't like it, you won't get the votes and you'll be out money. If you challenge someone with force, you could not only die, but if you defeat them, they'll come back in the next vote and really not like you.
Characters gain skill levels based on what weapons their stats better suit them for. However, you can have a swordsman use guns, but he'll gain skill levels slower than if he was using a sword. All weapons also have stats (duh!), but they can be progressed in a very interesting way. In the castle, there's a portal called "Item World" that allows you to enter an unequipped weapon. This opens up a multi-tiered battle. As you progress through levels, you can find "Coaches," who will submit to you once you defeat them. This will then grant special stats/powers to the weapon.
Afternoon of Darkness also offers a Ad Hoc multiplayer which I unfortunately wasn't able to test out.