Screens from the scenes from this movie:
http://www.javlibrary.com/en/?v=javlijzwti
Sougouwiki has IDed :
大石美咲・(あい)／
梅咲蘭／
あずみ真奈・
夢実あくび(かめおか)・(さえき)
Translation:
Misaki Oishi · (Ai) / Ran Umesaki / Mana Azumi · Yumi Yume (Kameoka) · (Ekishi)
That Mana Azumi is cute. She hasn't been in
much.
The third girl in the blue dress (sitting in the middle from your photo above) seems to be Akubi Yumemi. (
http://www.minnano-av.com/actress936614.html).
She has other names from the link above, and none of them resemble the Google translation of "Yumi Yume (Kameoka)." I know you're not interested in her, but just for the process of elimination...
I thought Misaki Oishi might be the girl on the right; her photo from the link below looked a little like her:
http://www.minnano-av.com/actress428746.html
But I guess not. I guess Misaki Oishi is in the first scene (with "Ai"), from the way Sougouwiki has listed the names, apparently in order of appearance. So that means the three girls dressed in blue should be:
Mana Azumi · Yumi Yume (Kameoka) · (Ekishi)
If the first two names are the ones that have been eliminated, that leaves "Ekishi." Not much of a clue, but supports Luckystar147's theory of her not being too experienced.
.
the left and the right one 
