I'm confused; I don't have the actual PV but there's screencaps on Eneabba.
http://eneabba.net/ayu/video/videoclips/33.Rainbow.htm If, according to ChrisKay, there's an A Ayu and a B Ayu, A Ayu must be the one in pink, B Ayu must be the one in red... but who's the one in orange? Throughout the PV, Ayu wears pink, red, orange, white and black. I'm confused.