There's no one here to stop you. Do it right: Sora and his pursuit for his Naminé slowly began to blind him from the truth. He is now on the twelfth floor without Donald or Goofy. Far deeper within the castle, Axel is keeping close watch on Naminé.

There Axel tells her that she should try to stop what she has begun, but she tells him it's too late. That's when Axel says that Marluxia isn't there, and convinces her to do what's right. She nods at Axels words and runs off to right her wrongs.

Soon afterwards upon reaching Sora in Destiny Islands, another Naminé is already with him. Sora becomes confused on what's happening, but the real Naminé begins to tell of the truth. She was not supposed to be there, it was supposed to be another girl; a girl he had long forgotten upon entering the castle.

Sora: "We were inseparable! But then I lost you... I came here so I'd never lose you again!"
Naminé: "Was it really me you came for?"
Sora: "Of course it was! I may have forgotten things in this castle, but not you! Look! You gave me this, didn't you?"
Naminé: "You still have it! My good luck charm..."
Naminé: "No, Sora! Don't believe me!"
Sora: "What am I supposed to do..."
Naminé: "Think, Sora. Think of the person who's most special to you. See that faint glimmer way in the back of your heart? That's a piece of your memory, Sora. Call out to it! No matter how far away the light gets, your heart's voice will always reach it."

After seeing Naminé, Sora' charm begins to change back to the Oathkeeper charm. He finally reaches the thirteen floor only to find Naminé. Sora now knows who's the one that's truly important to him, but he just can't seem to remember her name. As Naminé was about to tell him what was going on, Riku cuts in leading into a fight. As Riku was about to strike again Naminé tells him to stop, but he just continues. Naminé then yells, "I said, STOP!" A white flash appears and Riku suddenly stops falling onto the ground. Sora begins to panic and demands an answer from Naminé, but another interruption comes in.

Larxene comes in and says, "She broke his heart. More like smashed it, really." She tells Sora that he doesn't need to worry, because the Riku was a fake, a replica made by Vexen, another Oranization member.

Larxene: "Fake in every way. It was only finished recently. And without any past, how could it remember anything? Its memories with Naminé were planted, not real. All this time it's been picking fights with you over bogus memories. Isn't that right Naminé? Behind that cute little face you do some awful things."
Sora: "No...not Naminé."
Larxene: "You are so STUPID. Don't you get it? Messing with people's memories is about all she's good at. She steps into people's hearts and rearranges their memory. If she wants, she can even draw new memories of things that never happened. The girl you've been dying to protect...is a manipulative witch who shackles people's hearts with phony memories!"
Sora: "Then my memory... Everything I remember...it's..."
Larxene: "Lies, lies. All lies! An illusion Naminé made."

Naminé was the one who manipulated his memories. She was never loved, and never in anyone's heart until she re-arranged Sora's memories. Angered, Sora defeats Larxene once and for all. Naminé begins to apologized and tells him that Marluxia and the others had threatened her to do it all. She had been alone for so long that she did exactly what she was told to do. He tells her it's alright and he still did promise her that he'd protect her no matter what. Naminé smiles and Sora goes off to find Marluxia.

Soon after, Marluxia sees that Sora had left Naminé alone and takes her as his hostage. When Sora & co. finally do see Marluxia, they see him with Naminé. Marluxia orders Naminé to crush what's left of Sora's heart, but she refuses. Sora had forgiven her everything she had done and she would never even think of doing anything like that. Marluxia continues to tell Sora that if Naminé destroys his memories he'll be exactly like Riku. Riku comes back and strikes Marluxia. He tells him that even if he was just a fake, he had nothing to begin with. Soon Sora fights and defeats Marluxia, but they know he isn't gone yet. As Sora continue onto the next room, Naminé tells Sora she can fix his memories but they must defeat Marluxia in order to get to the other side of the thirteenth floor. Sora and co. soon proceed through the next door. He finally defeats Marluxia once and for all.