Yōko is a young woman who is forced into prostitution by a yakuza gang.

Kunishima Bank is owned by one of Tokyo's yakuza gangs.

Members of yakuza gangs cut their family ties and transfer their loyalty to the gang boss.

He was the 4th head of the Kokusui-kai, a Tokyo-based yakuza gang.

She soon discovers that her grandfather is a less than ordinary man: he is a head of a yakuza gang.

She begins to adjust to having the head of a yakuza gang as her grandfather and living in a house full of hoodlums.

Asagi is Sachie's grandfather, and the head of a yakuza gang.

There's more: she's a mod-punk brat who wants to hire a yakuza gang to kill the man she thinks abandoned her mother.

Sabu - The leader of a yakuza gang known as the "Sanwakai".

In some cases a person expelled from a yakuza gang might be required to perform the yubitsume ritual.