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hikki very popular in japan because she is consistance with her music..
it's different with ayu..
ayu not only make a good music..but she is trendsetter and should give something WAH.....
hikki's sales bery well because she realese album every 2 year or more..and ayu realese album every year..
for single sales, ayu's sales quite steady..
she always sell at least 100K...
different witk hikki.her single's sales not steady...
there are singles sell well and bad...
and the position didnt well as ayu
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