I read the first three volumes of the manga and let me tell you that it is very interesting even if it is quite disturbing. Some paraphilias are quite disgusting, I must admit, but they all bring a reflection on society and conformism, and this is all the more obvious since the story takes place in Japan.
The chapter that marks me the most is the last chapter of volume three, on normophilia, which highlights the contrast between the conformity of the Japanese and the sexual tastes both taboo and known to Westerners.