A long time ago, Merlin was a Keyblade wielder alongside Terra, Aqua and Ven. Years later, his past comes back to haunt his new life and destiny. Xehanort is back. Again on an adventure, this time with Arthur in tow, Merlin fights to save his friends, and the universe. But secrets are revealed, making him wonder who he truly is. And poor Arthur just wants to know what's going on.

Merlin tries to save Camelot and Arthur from strange shadowlike creatures, but what happens when his magic has no effect on them? And who is this strange brown haired boy that saves him?