Tales of old centuries tell the stories of the hero Sora, who fought the malevolent Xehanort and saved the Worlds by preventing his plans to forge the x-blade. Kingdom Hearts was saved.

Now, there is no more heroes. Keyblade wielders are few, Keyblade Masters even fewer. The location and nature of Kingdom Hearts an unknown. Heartless from the Realm of Darkness and Nobodies are spreading through all the Worlds in the Realm of Light and the Realm Between, many of them reduced to barren land.

Your name is Aliquis. You wield a Keyblade yourself, with the shape of simple rusted key. Despite this, you fight with efficiency, agility and cunning, making you a formidable wielder.

You have no recollection of your past, no knowledge of your nature and essence, not even why you have a Keyblade in the first place. You walk the Worlds aimlessly, your only drive is to protect people from the Heartless and the Nobodies.

You are now walking in a World of the Realm Between, no person in sight, but it's nature seems untouched from the plague of the Heartless and the Nobody. At least yet.