Spira was home to highly developed civilizations until 1000 years ago, when Sin first appeared. Sin is a trespasser, a scourge upon the land. It falls only to rise again, bringing chaos and destruction to Spira's technological advances.

A group of travelers from different tribes and walks of life will set aside their own beliefs to save their crying world. Together they will guard a young Summoner determined to defeat Sin at all costs.

The party journeys to the very ends of the world, visiting temples and bonding with Aeons. As the Summoner gains new strengths, she prepares to receive her 'Last Summoning', the only power that can defeat Sin and save the world.