I use Ecliptic Orbit for information who composed what. And although it is dated now, it bases all composition/arrangement/lyrics/vocal listings based on the OSTs of the IIDX games. and they don't have Aoi Shoudou listed as being sung by Miyuki Kunitake:
http://web.archive.org/web/20080319064912/www.psn.ne.jp/~slayer/allmusic/aoishoudou.html --M.B. 22:06, 14 September 2010 (UTC)
Also, considering how many various vocalists NAOKI uses, that girl could be a different girl that has Yuki in her name.