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					Originally Posted by Katsuyuki012  
It's obviously Ayu doing the routine (and very well at that, IMO). The reason why they filmed it at such a distance is in order to make sure that no one notices anything in case she lip synchs the wrong words. In short, the vocals for that performance were pre-recorded. 
I'm quite sure the DVD will have lots of close ups/closer shots.    I really enjoyed the performance. | 
	
 Yep I ate my words after I saw all the nice close-up photography 

Your explanation about lip synching makes sense!
Will be great to see the closer shots in the edited version 
