At the Mysterious Tower, Kairi informs Yen Sid, Mickey, Donald, and Goofy about Riku's decision to go alone to Quadratum to look for Sora. Mickey, worried about Riku in a unknown world, tries to go after him but is stopped by Donald, Goofy, and Yen Sid. Yen Sid learns from Kairi that Terra-Xehanort had been researching the "fictional world" since his time as an apprentice, but with the defeat of Xehanort, there is no one else who knows anything about it. Yen Sid recalls from his days as a Keyblade Master that in the past, ancient Keyblade Masters had also crossed into the other world and that Terra-Xehanort had been looking more deeply into it.
Yen Sid then tasks Donald and Goofy to gather the other Keyblade wielders in Radiant Garden, the Land of Departure, and Twilight Town to stop searching for Sora and inform them about what they have learned. Kairi, wanting to go back to her Keyblade training, wishes to learn under Aqua, which Yen Sid approves. Finally, Yen Sid tasks Mickey with learning about Quadratum and how it relates to the ancient Keyblade Masters by sending him to Scala ad Caelum.
An Oath to Return
Characters in order of appearance
|Kingdom Hearts Melody of Memory|
|Kairi - Sora - Roxas - Aqua - Riku|
Donald Duck - Goofy - Axel - Xion - Terra - Ventus - Meow Wow - Komory Bat - Mickey Mouse
Hercules - Aladdin - Ariel - Peter Pan - Beast - Fa Mulan - Simba - Stitch
|Xehanort - Ansem, Seeker of Darkness - Xemnas - Maleficent|
|Aeleus - Ansem the Wise - Even - Fairy Godmother - Ienzo - Nameless Star - Terra-Xehanort - Yen Sid|
|Mysterious Tower - Radiant Garden - The Final World|
|An Oath to Return - Another Key - Key Art - Keyblade - Museum - Rhythm Points - Story Scene - The End - VS Battle - World Tour|
|Kingdom Hearts Melody of Memory - Special Disc - Unnamed tracks|
|Artwork - Bosses - Enemies - Items - Trophy - Songs|