The "sprawling role-playing epic", which is a sequel to 2009 Wii title Little King's Story, will be released on Sony's handheld device in 2012.
The game puts players in the shoes of King Corobo, a plucky 14-year-old royal tasked with reclaiming his kingdom from an invader known only as The Nightmare.
Developed by Marvelous Entertainment, the game features real-time strategy and role-playing elements, as players use the PS Vita's touch-screen to arrange army recruits and send them into battle.
Recruiting advisers and warriors adds stat boosts to your army, while successfully pushing back The Nightmare sees townsfolk return to their normal lives and routines.
PlayStation Vita will be available from February 22, 2012 in North America and Europe.
Watch a PlayStation Vita showreel from E3 2011 below: