When Sora, who held Kairi's heart within him, arrived and drove off Ansem, he used Ansem's Keyblade to free Kairi's heart and return it to her body.

However, Ansem's Keyblade and the Final Keyhole were incomplete due to the heart of Kairi―one of the Princesses of Heart―being absent. Plotting to seize Maleficent's work for himself, Ansem possessed Riku's body and created a unique Keyblade from the hearts of the Princesses to open the Final Keyhole. In addition, to access this Kingdom Hearts, Maleficent and her allies began a hunt for the Seven Princess of Heart, maidens with hearts of pure light who, when gathered together, would reveal a portal called the Final Keyhole that would unveil the path to Kingdom Hearts. For each world the Heartless destroyed, the heart of that world would gather with the others in the enclosed realm of darkness where they formed a Kingdom Hearts of the worlds' hearts. In order to create a Kingdom Hearts of the worlds' hearts, the villains released a great number of Heartless across several worlds in order to have them consume these worlds' hearts. In Kingdom Hearts, the diabolical Maleficent and her league of villains sought out a way to obtain a Kingdom Hearts of the worlds' hearts in order to obtain unimaginable power and knowledge to rule all worlds. In truth, this would bring about a purge that would return the World to whence it started, destroying the existing World in the process. Accordingly, if one would manage to open Kingdom Hearts, this person would bring about the creation of the Next World and supposedly be reborn as something far greater than human.

Kingdom Hearts itself was protected by its counterpart, the χ-blade, which is the only key capable of unlocking and accessing Kingdom Hearts, so that no one could ever lay hands on its mysteries. From Kingdom Hearts came the people, and the people had hearts. Eventually though, out of that darkness came the first light in the form of Kingdom Hearts, which became the one source of all true light in the World. In the beginning, the World began in darkness.

2.5 Kingdom Hearts 3D: Dream Drop Distance.

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