you were trapped in the Realm of Darkness for approximately 9 years, and while wandering through this desolate hell, you find a woman healing herself from very deep wounds, probably caused by a powerful Heartless, like a dark tide or something

Aqua: "Ouch... The Heartless are becoming stronger and stronger... I don't know if I could survive fighting against the dark of the whole universe's hearts..."

she then hears your steps, turning her head into them

Aqua: "Who's there!? Show yourself!"