A chip off the old block.
A spin-off of the RPG Persona, Fes (or "Festival of Persona 3") consists of Persona 3's content along with 30 hours of additional gameplay. The new gameplay comes primarily in the form of the "Gojitsudan," a story sequence that comes after the original's ending, with new cinematic sequences in addition to the added gameplay. While the main storyline is the same, it's been tuned up with new events. Gameplay has been updated as well, with a new "hard" setting (the original had just easy and normal), 23 new Personas, a weapon synthesis system and a system for changing your characters' clothes.
~Check my original Persona 3 review for more details on the game play and story.