Kingdom Hearts Chain of Memories

Story

Sora, Donald and Goofy have just defeated Ansem. They saw Pluto and started to follow him. He led them to two paths. While diciding which path to take, a mysterious man approaches Sora and says some confusing things. The path then becomes one and it leds them to Castle Oblivion. They go through each floor, expierncing their memories. As they wander the castle floors. They start to lose their memories. Sora then loses his memory of Kairi and replaces it with a girl named Namine. It turns out she is a (good) witch who is malipulating his memories under the orders of the head of the castle, Marluxia. They end of battling in the end. You will have to play the game to find out what happens...!

It should also be known that you didn't have to play this or the first game to understand Kingdom Hearts 2, but it sure does help.