Sora, arriving early, helps Twilight figure out the meaning for the mysterious chest, so they head for the abandoned castle to research, their friends for their own reasons, as well, but they may find more than they bargained for...
Sora needs a new training ground to prepare for his Mark of Mastery exam retake, King Mickey sends him, Donald, and Goofy to a new world for such a task, but will it be another world in danger?
Sora and Donald arrive at Canterlot High to search for a magical disturbance by the order of King Mickey, But when they get there, they get more than they bargained for.