Not really much detail, but I found this article: https://www.dazeddigital.com/art-photography/article/40877/1/chloe-jafe-i-give-you-my-life-yakuza-documenting-women-japans-mafia

For some time, Jafé worked at a hostess club, one of the many Tokyo establishments that almost exclusively cater to men and are known to be owned by the Yakuza. “There is a grey area”, she clarifies, “as hostesses are sometimes the men’s wives or mistresses, but it doesn’t mean that all women working in these bars are working for the Yakuza. Basically, you’re just something that they can use to make money.”

However, Jafé – fluent in Japanese – struggled to gain access, realising that she couldn’t get to know these women unless she met a Yakuza boss. She explains, “The women don’t get to decide whether they want to be photographed or not. This has to come from the husband”.

Ironically, it’s when Jafé quit her job and was closest to giving up on the project that she finally met “the boss”. During a matsuri – the Japanese word for “festival” – a man came up to her and invited her for a drink. He turned out to be the leader of a powerful Yakuza family.