.
I encountered an indirect plea by
Palaman2122 on another I.D. thread, and he sounded so passionate about trying to unravel his mystery movie, I wanted to see what I could do. (And when I looked at the clip, I realized I had already been down this road, in the past.)
I notice Palaman2122 not only got the attention of two knowledgeable
Akiba-Online moderators in offering to siphon brainpower, but two of
Akiba-Online's lesbian savviest,
LoveGIANT and the always delightful
Savajex. (It's funny how others hoping to uncover their own lesbian mysteries hopped on board here, as long as they had the attention of these two masters.)
I will also reference comments from one of Palaman2122's two other threads, specifically
the one from the "Identification Help" section.
To address this theory of yours, Palaman2122:
I think i cant find this vid by that name because they didn't listed her name in this movie but listed the girls as "various".
Sites such as the invaluable-for-English-speakers (although hopelessly incomprehensive)
Asianscreens.com (which you have referenced; they have a very inadequate
page on the actress in question, with only ten films listed; they only list the movies where the star is the sole attraction, but co-starring movies will go in their "Multiple Actress" section) will use the "various" word as shorthand for films with too many actresses, or films where the actresses are not known. But this does not mean the more comprehensive sites will ignore the unknowns.
JAV can be frustrating in that it's not unusual for the performers not to be given credit. JAV aficionados rush to fill in the gaps, particularly with the Wiki-style
Sougouwiki. As comprehensive as
DMM is (Member
Nick Wells colorfully referred to it as the "holy grail"... and it's true), I have found the
Sougouwiki contributors often catch the performers or films that DMM has missed.
(You referenced another site,
Immoral.jp, one that I never heard of... they are pretty good! For kicks, I measured their film list versus
Sougouwiki's, and
Immoral was short ten. 129 vs. 139.)
So with the revelation of the main actress at hand (you mentioned you were 99% sure about the correctness of her identity; we have Member
Rie Kumiko to thank for this valuable recognition)...
Ryo Tsujimoto
... It seemed to me a good bet to meticulously go through the listings of Ryo's
Sougouwiki page. For good measure, I had a Google-translated version running at the browser's next tab. In other words, if the cover did not relay enough clues regarding the lesbian-schoolgirls-attacking-the-teacher theme, the accompanying Engrish would serve as a back-up, for additional clues.
(Now this process took much longer than it should have, because one inevitably runs into a cover and description that appears so engrossing, one must stop and address the question... What IS that? And then the inevitable second question follows, How come I don't have that? Then we have to stop and look around if we can find it, yadada yadada yadada.)
You can take a look on that page as well, for there is an outside chance I could have missed the movie - although it's a very outside chance, because I checked pretty carefully. So the only explanations are, this is such an obscure movie nobody knows about it. (The odds would be against that.) Ryo made a movie where no one knows Ryo appeared in it. (Eh!) Or, even though you were almost positive that the actress was Ryo (and I didn't scrutinize the actress from the clip myself, but I believe you), I suppose there is that one percent chance that the actress is somebody else. If that turns out to be the case, then it's back to the drawing board.
I'm a big fan of lesbian schoolgirls tormenting their teachers, and I look forward to the time this question gets answered, as well.
.