Three youths — Terra, Ventus, and Aqua — have been training long and hard under Master Eraqus to prove that they, too, exhibit the Mark of Mastery. But they will soon find themselves in the middle of a crisis affecting worlds far beyond their own—just as another Keyblade Master, Xehanort, goes mysteriously missing. Aware of the threat, another master ordered his three apprentices to seek out Xehanort and his cohort. Their destinies will unfold across memorable Disney worlds in three intertwining stories. Secrets will be unraveled and friendships will be tested. The Kingdom Hearts saga starts here.