That's true what immel said, it's quite common in Europe and U.S. to lip-sync especially in TV-performances and also in some live-shows which I think it's crap :/ But as far as it comes to my opinion about ayu doing lip-sync, I really doubt that se would do a lip-sync without a proper reason :S I've watched many of her liveperformances and the seasons video from page1 was the first one that sounded and looked like a lip-sync.
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