The story begins with Sora, Riku, and their friend Kairi as young teens in their home of Destiny Islands. Creatures known as the Heartless invade, and the friends are separated. Sora, after acquiring a weapon known as a Keyblade, finds himself in Traverse Town. There he meets Goofy and Donald, who are searching for Keyblade wielders under orders from the currently missing King Mickey.
They overcome the Heartless and foil their plan to infiltrate Kingdom Hearts, “the heart of all worlds”. A new threat appears alongside the Heartless in the form of Organization XIII, composed of incomplete beings known as “Nobodies”. They plan to create their own version of Kingdom Hearts, and use it to make themselves whole. This plan is scuppered too.
Sora, Riku, and Kairi learn, through a…