Final Fantasy XIII-2 is set 3 years after the events of Final Fantasy XIII. Lightning (Final Fantasy XIII heroine) has gone missing and only her sister, Serah, believes she is still alive. Upon meeting a mysterious time traveler by the name of Noel who claims he has met Lightning during his travels, a determined Serah sets off on an adventure to reunite with her sister. FINAL FANTASY XIII-2 is the sequel to FINAL FANTASY XIII, which was released in North America in March 2010 and has shipped 6.2 million units worldwide. The sequel has evolved beyond its predecessor, with an extraordinary level design encouraging exploration, a new battle system allowing players to command monsters and a variety of options that support multiple playthroughs.