The original Summon Night games were strategy RPG's similar to Tactics Ogre, but this, like the GBA games, is more action-oriented. It stars two plucky youths named Aldo and Leeha who want to become great summoners-- you know, standard RPG stuff. They want to be the very best, like no one ever was. To find gems is their real test-- to use them to summon monsters is their cause.
Twin Age will be released in Japan in August. No word on if Atlus will pick it up for localization.
Gallery: Summon Night: Twin Age