Don: Gokudou Suikoden (1992)

Date Bukishi is a young man whose family is the old Date-Gumi yakuza group, however, he is not an active part of the Yakuza lifestyle and focuses more on fighting and doing as he pleases. His life turns around when he ends up in prison where he meets his eventually to be most loyal friend, Hyoroken, and together they gather more loyal men to their side, eventually following in the footsteps of the Yakuza world. Conflicts erupt with the Bando-Gumi leader Muroto who is hell-bent on uniting all of the japanese Yakuza under one banner, his banner, and in his way stands the future boss of the Date-Gumi, Bukishi.