^ why do you think this is a demo, and why do you jump to conclusions this will be a single? I mean, it could happen, but there's no way we can be sure.
As far as I know, this is a full, 100% finished song, available as a first press bonus track in Japan.
I do agree it will eventually be included on a single / album / best, but it'll probably be the same song available on chaku-uta now. She wouldn't officially release a demo, right.
Oh and about the song: it sounds brilliant!! I want it on CD right now!
