The game takes place in the world of Fillujah, a world where all people have their own flying companion creature. The core three characters of the cast, Raj, Amu, and Ist, are all original characters, though the game plot involves them meeting up with suddenly-appearing strangers, who actually make up of character from prior Summon Night entries. Source: Wikipedia, "[en.wikipedia.org/wiki/Summon_Night_6 Summon Night 6]", available under the CC-BY-SA License.