Long ago, in the age of fairy tales, the world is protected by seven keyblade welders who reside in Daybreak Town. But when they find a missing page in their Book of Prophecies, they learn that there is a traitor among their ranks, forcing them to answer the question: Who can be trusted, and who can’t?

Two years have passed since the final battle with Sephiroth. Though Midgar, city of mako, city of prosperity, has been reduced to ruins, its people slowly but steadily walk the road to reconstruction. However, a mysterious illness called Geostigma torments them. With no cure in sight, it brings death to the afflicted, one after another, robbing the people of their fledgling hope.