An activist fighting the notorious "JK" industry has called on Prime Minister Shinzo Abe to initiate efforts to eradicate the increasingly knotty problem of sex trafficking involving high school girls in Japan, describing the nation as too indifferent toward curbing child prostitution.

Speaking at the Foreign Correspondents' Club of Japan in Tokyo on Thursday, Yumeno Nito, 25, founder of Colabo, a Tokyo-based support group for marginalized teen girls, said the situation surrounding the part-time job industry and sexual exploitation of joshi kosei (high school girls) has gotten worse.

Although progress has been made by police to round up the girls and ban the distribution of racy flyers on the streets, Nito said the traffickers who hire them continue to outsmart authorities by exploiting legal loopholes to create variants of their businesses.