How Nishimura Mako became only woman in Japan's Yakuza crime gang

Nishimura Mako is a petite woman in her late fifties, with flowing hair and a delicate face. But you soon notice that she is no traditional Japanese lady - she is tattooed up to her neck and hands and her little finger is missing. These are signs of affiliation with the yakuza - Japan's notorious criminal syndicates.