High Quality Content by WIKIPEDIA articles! The tenth game of the Final Fantasy series, Square`s 2001 bestselling console role playing game Final Fantasy X revolves around a summoner and her guardians aiming to defeat a creature known as "Sin" in the fictional universe of Spira. The characters were designed by Tetsuya Nomura. The game`s sequel, Final Fantasy X-2, takes place two years after the events in Final Fantasy X and uses almost the same cast of characters.