assaulted on public transport across east asia. visitors to one of the sites could even order their own tailor made videos. bbc eye sjow yin fung reports from tokyo. this is nagoya injapan. translation: there is a guy looking for a target. - the railway police are running a covert operation, on the hunt to catch sexual assaulters. translation: | would - like to follow him to check his behaviourfor a bit. sexual violence against women in public is a global phenomenon. but injapan, the problem is so endemic that it has its own name, chikan. translation: you re riding back and forth on a single ticket. - it looks like the kind of behaviour a chikan perpetrator would make. the suspect is taken to the police station for further questioning. chikan has been normalised over the years by its prominence in the adult entertainment industry.