KINGDOM HEARTS χ Back Cover is an HD Cinematic included in KINGDOM HEARTS HD II.8 Final Chapter Prologue. It address the major events of KINGDOM HEARTS Unchained χ and sets up plot points to be resolved later in KINGDOM HEARTS III.

The Cinematic centers around the Master of Masters, his apprentice Luxu, and the five Foretellers, and illuminates the events leading up to the first Keyblade War that almost destroyed the World.