Unveiled at E3 2006, the game focuses on a mysterious protagonist who is the last heir of a dynasty ruling over the only remaining city to control crystals. Under unforeseen circumstances, he makes a stand against marauders seeking to take the crystal as their own.
Final Fantasy Versus XIII is, according to its developers, a wholly independent story unfolding with different characters and a different visual design. Although it is set within the same Final Fantasy XIII universe, it is unrelated to any other entry within the compilation and is thus neither a sequel nor a prequel to any other entries in Fabula Nova Crystallis: Final Fantasy XIII.
There is scarcely any information surrounding the gameplay and battle system of Final Fantasy Versus XIII because no formal footage has been shown by Square-Enix of the gameplay online or within video game magazines.