The difference is that Momo has never been to US and she isn't in the spotlight.
I can see those fanatic "human" rights group would pick on LadyBaby for the reason that the girls are/were junior idols.
They won't have any problems at home in Japan, its just US thats worrisome.
Rei is quite popular from just looking at the number of DVD under her name.
I think she is as popular as Momo once.
I am not sure currently as I don't notice her much recently.
Has Rei retired like Momo?
What is strange is that I have not noticed Rie Kaneko before in the junior idol circuit before
The only reason I can think of when they have to change their names is becoz of copyright issues.
Some models that I notice would change names when they change agency.
This is what I also noticed, when a model decides to go into more mature gravure stuff ( not talking about AV just more risque ), they would change their name in order not to be associated with their previous released titles.
My guess is that the copyrights owners of the casual gravure titles do not want to be associated with those more risque productions.
As Blu-Cherri pointed out, KPP has done lots of gravure as a kid too and she has been to many different countries. No issues there. Rie joined the game fairly recently which is why you won't find anything from her early teen years. I still don't understand why you are bringing all this up. All this gravure talk and name change stuff has literally nothing to do with them as a group. It's completely hypothetical and unrealistic, we might just as well talk about being worried they might get shot at a gig. It would be great if this could finally get dropped.
So here are two cute short videos of Rei hanging out with her sister
https://twitter.com/...577533848985600
https://twitter.com/...460540286238720
