Ayu can't really see herself from the audience POV while she is rehearsing her performances so she normally uses her "double" to act as her so Ayu can see herself and make improvements on her positioning and such during the performance.
She seems to have other tasks too. In the AT07 documentary DVD you see her throw suggestions out to Shuya on his hand positioning with Ayu during the appears Paso Doble dance (might I add what a lucky bum he is to get to put his hand there). And yea she also follows Ayu around in the overseas airports and the Shanghai temple. I'm guessing shes an advisor to Ayu or something.
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