Acts during battle (such as leaving dark portals unpurified, attacking allies and opening presents) increases dark energy, and purifying the map decreases it. When the Index reaches 100, a portal opens which can be used to enter the Dark World (a series of randomly generated levels full of enemies and dark portals). The strength of Dark World enemies varies; the higher the Dark Energy Index, the stronger the enemies. The PSP release included bonus content such as playable characters from the Disgaea series and the ability to retain characters/equipment restarting the game to enjoy the different chapter endings without losing progress. It also featured a new storyline exploring what it means to become an Overlord. Plot and characters La Pucelle takes place in a kingdom named Paprica. The story centers on a small church, the Church of the Holy Maiden, in the city of Pot a Feu. In addition to the normal role of a church it has a group of trained demon hunters, La Pucelle. Two of La Pucelle's newest members are Prier, a sixteen-year-old girl, and her twelve-year-old brother Culotte. The Dark Prince, favored servant of the fallen angel Calamity, will reportedly rise to scourge the land. When the prince rises a warrior, the Maiden of Light, will challenge him and restore the balance of light and darkness. Prier hopes to be the Maiden of Light. The game's story is divided into chapters. Each chapter has a number of endings, depending on information discovered by La Pucelle. Its characters are: Prier—Apprentice Demon Hunter and the game's Byronic heroine Culotte—Prier's younger brother, who tries to act more mature than his sister Alouette—Prier and Culotte's teacher Croix—Former freelance demon hunter who joins La Pucelle Eclair—Princess of Paprica and close friend of Prier and Culotte Homard—Leader of the Chocolat gang Yattanya—Former Chocolat gang leader Chocolat gang—Group of air pirates Monya-Monya—Pilot of the Chocolat pirate airship Papillon—Fairy with a crush on Homard Father Salade—Founder of the Church of the Holy Maiden and La Pucelle Noir—Head of the Church Of The Divine Mother, church of about two-thirds of Paprica's population Most of the names in the game are French. La Pucelle was a nickname given to Joan of Arc. Some names are religion-related (Prier, to pray and Croix, cross), some others are food-related (Salade, salad; Chocolat, chocolate; Homard, lobster and Mount Champignon, mushroom) and the rest are unrelated to either (Papillon, butterfly; Noir,