Horizon on the Middle of Nowhere Portable is a PSP adaptation of the like-named anime and Minoru Kawakami light novel. The PSP adaptation is a "school sengoku RPG" featuring missions, 80 characters from the anime and novel, and a turn-based four member party battle system.
Siliconera: The light novel Horizon on the Middle of Nowhere is coming to PSP next year with a game called (we’re not kidding!) Horizon on the Middle of Nowhere Portable: Boobies Paradise. It’s part adventure game and part RPG. Players can put chibi characters in rows and formulate a strategy to attack enemies.
A video game based on Horizon on the Middle of Nowhere is in development for PSP and it sounds like it’s designed for strategy RPG fans.
