Kingdom Hearts: Chain of Memories

After Ansem is defeated and the world is restored, Sora, Donald, and Goofy embark on a new mission to locate Riku and King Mickey, who are trapped beyond a sealed dark door. Their journey takes them to the Castle of Oblivion, where they face members of a mysterious organization. As they advance, the trio begins to lose their memories. The experience forces them to confront the meaning of holding onto something precious. Sora must ultimately decide which path to follow.