Long before Sora was chosen by his Keyblade, the worlds’ safety lay in the hands of others known as the Keyblade Masters. It is under one of these, Master Eraqus, that three young people have been training long and hard to prove that they, too, exhibit the Mark of Mastery: Terra, Ventus, and Aqua. The three of them 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. Three friends, three purposes; one horrible fate toward which they must unknowingly march…