KIYO confirmed to be Ryo Mizutsuki as per her works list
http://www.fujitsubo-machine.jp/~kiyo/works1.htm
She composed NEWYORK(STAGE5) and THEME OF ZALAZOF
Not sure if that makes her a former Alfh Lyra member and she should also be linked to Cadillacs ~New Dinosaur Century~ (PCCB-00133 not in her works list)
Interesting to see SYUN and KIYO collaborate as early as 1993