Its more about Kairi then Namine. =/
The song is Cinderella by Sweetbox.
Its about Kairi and how she wishes she was Cinderella. Have to watch and find out if she ever becomes Cinderella or just lives in her shadow.
The Mysterious Figure's Battle theme in Birth By Sleep. The story before the story, that makes the future story even more complicated and fun! HE IS NOT XEMNAS FYI!
Song: Where'd You Go
Artist: Fort Minor
Story: Kairi grows sadder and more angry with each passing day Sora isn't around to defend, comfort, and be with her.