Left alone to ponder the purpose of her existence and desperate for answers, Xion journeys alone to find out who--or what--she really is. But little do she, Roxas, and Axel know that her quest will lead to the close of one tale and the continuation of another...

Soon after his birth as a Nobody, Roxas joins the mysterious Organization XIII, knowing nothing of his identity. With the help of Axel, another member of the Organization, and the mysterious No. 14, who is also missing her memories, Roxas slowly begins to learn what it takes to be a part of Organization XIII...and what it means to have a heart.

It's only been seven days since Roxas was told by the Organization to look after a new Nobody. Though this newcomer's face and body are hidden by a hood, Roxas spends many meaningful days with this mysterious stranger...

Left alone to ponder the purpose of her existence and desperate for answers, Xion journeys alone to find out who--or what--she really is. But little do she, Roxas, and Axel know that her quest will lead to the close of one tale and the continuation of another...

Xion, having failed her last mission, is left unconscious and out of commission. Unfortunately, Roxas doesn't have time to worry about his friend because he's been ordered to go to Wonderland with Organization XIII's No. 10-the Gambler of Fate, Luxord. Can Roxas keep up with the old man's games?!

On the Destiny Islands, three children--Sora, Riku, and Kairi--are living out their peaceful, carefree lives while yearning for whatever lies beyond the great ocean. But one night, an unexpected disaster takes place, and the three are torn from each other and their island home. Meanwhile, at Disney Castle, Donald Duck and the other castle residents are in an uproar upon discovering King Mickey has suddenly gone missing. When fate brings them together, Sora, Donald, and Goofy set out on a grand Disney adventure to find their friends!

When Xion loses her Keyblade, it's Roxas's job to make sure no one finds out. As long as the two can go on missions together, no one will know that it's Roxas collecting all the hearts. But will Demyx blow their little secret? And when the Organization issues an order to Xion to capture an outsider masquerading as one of its members, who will come out on top in the ensuing battle?!