Japayuki-san vs KTV girl

Japayuki-san

noun
  • A Filipina who travels to Japan to work as an entertainer, with implications of prostitution. 

KTV girl

noun
  • An attractive young woman employed by a KTV bar to serve drinks and snacks and to sing along with male patrons. 

How often have the words Japayuki-san and KTV girl occurred in a corpus of books? (source: Google Ngram Viewer )