Yakuza Wolves: The Yanagawa Gang (2002)

Based on a novel "The Battle Of The Yanagawa-Gumi" by Koichi Iiboshi, it tells the story of criminal Jiro Yanagawa. Released from prison, Jiro joins the notorious Yoshimizu Yakuza family as a member. Not long after however, he sets out to form his own Yakuza clan in Osaka. This sparks a bloody territory war with the Devils Dragons.