Is pretty much what this video says. The game is also for iOS and Android, making my worry slightly. Apparently, the game is a mini JRPG that's heavy on the combat. The Vita version will feature the same story and gameplay, with some extra characters and scripts.
In the game, players recruit characters into an army in order to defeat the menacing Black Army.
Ah, found a gameplay clip which explains a lot more. The game's name derives from the interlocking relationships among this vast cast of more than 200 characters. Akira Ishida voices 46 of the characters, and Ai Nonaka, Shiori Mikami, Ayane Sakura, Maaya Uchida, and Kotori Koiwai also have roles.