That might be my assumption but the two times I had with their Japanese ladies, made me doubt that they are pure Japanese. As I mentioned in my other reviews, I try to make conversation in japanese with the ladies who claim to be from Japan.
To be honest, neither of the girls I saw in that establishment seemed to be a native Japanese speaker as one of them even refused to make communication in their language. (I had sessions with Miho at Crystals. you can always tell she's pure Japanese as I even had a Japanese dirty talk extra with her which I enjoyed a lot )
The girls there presented as Japanese, in my humble opinion, might be either half jp half Chinese or lived or studies in Japan and might know Japanese. Anyhow, these info I'm sharing is just from only 2 reviews and does not apply for all their ladies.
So, I cannot say that for other present girls there but I had bad luck with my visits to their establishment and considering the rate they charge, these failures surely made me frustrated.