Halp.. Again O__o

[Tsukuyomi]

Does anyone know who the artist is at 4:31?

http://www.youtube.com/watch?v=et0CyL35CfI&feature=related

Her voice is so familiar, but.. ERRRRRRRRRR D:<

EDIT: I found the song ^ ^

Feel free to any mods that come this way to close this thread. Or, it can be used for anyone else who needs help identifying a song ^ ^

A title change may be in order, though :-?