No idea why this is even a thing.
Sex "industry" (cannot call it industry, it produces nothing aside of broken individuals) is the worst thing that can ever happen to a woman, because she will not be able to lead a happy life after sleeping with multiple men. It makes it look just like it's nothing or "a normal job" when in fact it is not, and it destroys the life of both men (those who visit the brothels instead of persuing a relationship with a woman normally) and women (those who work in said brothels to "satisfy" the male customers) equally.
120 IQ people like the Japanese should know better, this story isn't even trying to make a parody out of prostitution, nor is it trying to shine a light on the inevitable problems. I liked how "Jin" dealt with the issues of prostitution with a sense of tragic insight, but this is just too positive.