From 2006 to 2007, I worked on US State Department sponsored project to study human trafficking in Japan, and contributed a large portion of the final report. At the time, Japan had serious problems with a thriving trafficking industry. I would reluctantly have to say that things have improved a great deal since the original report was written. Human trafficking in Japan hasn’t been eradicated but there seem to be fewer victims and the harsher penalties and enforcement have made it a less profitable business venture. However, you may find the report interesting in its discussions of links between anti-social elements and Japanese politicians. The link to the documentary and the printed report should be available by clicking the red map of Japan.