Destiny Islands
As Aqua drifts within the darkness, Mickey reaches out for her. She awakens, only to realise the images of Terra and Ventus are nowhere to be seen. She then learns from Mickey that ten years have passed in the realm of light, and that the thread of darkness looms ever close. On top of that, Terra still hasn't been found. Mickey explains that he's looking for a Keyblade that could prevent the spreading of darkness, and Aqua decides to search with him.
Before long, they arrive on a beach beneath a clear blue sky. Aqua shares that this is the place she met Sora and Riku - Destiny Islands. Hearing that convinces Mickey they're in the right place.
They find a cave, and within it - behind a door - the Keyblade. Mickey takes it in his hand. A bright light engulfs them, and when they open their eyes, they find themselves before the open door to Kingdom Hearts. To prevent darkness from escaping and destroying other worlds, Mickey knows he must close the door with the combined power of his and Sora's Keyblades.
It's not long before Riku appears to close the door, but he's chased by a monster of darkness. Aqua steps in front of the creature's path and is swept outside the cave. The door to the outside world vanishes, separating Mickey and Aqua. As Aqua fights the monster, she realises that she cannot go home yet, but knows she'll make it there one day.
Then together, Sora and Mickey close the door to Kingdom Hearts.
Laying on the beach, Aqua watches as the world restores itself around her. Left behind in the darkness, she falls deeper and deeper into the abyss. However, her expression is peaceful and serene.
