Invisible stamps are the latest weapon in the war on groping in Japan - but are they working?
Sexual harassment is so commonplace in Japan that some trains now have female-only carriages. Here's how it's being tackled.
Brianna Holt is a Special Projects Deputy Editor at QZ. Prior to her work at Quartz, she worked as an editor at BuzzFeed with a focus on music and culture. She also contributed to One37pm's music vertical and Tinder's relationship publication.