My name is Hart. Hart Glenn. I'm a Keyblade wielder. Pleased to meet you. What? You thought there was only one Keyblade wielder? Nah, there used to be lots of us.

We were called upon by the Light when the worlds were all one world. We were called to defend the Light and the Heart Of All Worlds, known as Kingdom Hearts. But that was a long time ago, before the Great Keyblade War. Back then, most children had the ability to call out a Keyblade because children were the purest, those whose light was not yet shadowed. But then the war came and thousands upon thousands died. Keyblade wielders, innocents, guardians...

Then, the Grand High Council of Light sealed the Forces of Darkness away in the Light of Kingdom Hearts. Kingdom Hearts saw the devastation that had been caused by the power of the Keyblades, and took the power away from all, but not before the world had been partially restored by the children. It vowed to never let this power into the wrong hands again, and so only chose a few children with the purest hearts to gain the power to wield the Keyblade in times of the direst peril, and even then it was a last resort.

This is a story of the times of the war, a time of Light and of Darkness...