The treacherous battle against Xehanort at the Keyblade Graveyard had been won by the guardians of light, with one devastating casualty, Kairi. Desolate and inconsolable, Sora sets out to save her, despite knowing the consequences. With Kairi home, Sora has disappeared. His friends search for clues of his whereabouts, discovering that Sora as they once knew him may no longer exist.