Monster Kingdom: Jewel Summoner

Monster Kingdom: Jewel Summoner is a role-playing video game developed by Gaia and published by Sony Computer Entertainment for the PlayStation Portable. The game was released in February 2006 in Japan and in February 2007 in North America by Atlus. The game takes place in a world where monsters and human beings once lived in harmony. The monsters were hunted and many of them were eventually imprisoned in devices called "jewels". Once trapped in a jewel, a monster becomes tame and servile to the owner of the jewel, allowing human warriors, called Jewel Summoners, to use them in combat against other monsters.