Japanese Godfather Trilogy

Nihon No Don (日本の首領, approximately translating as The Japanese Godfather or The Japanese Don) is a Japanese trilogy of organized crime films released from 1977 to 1978. Very loosely based on the real-life exploits of Japan's biggest yakuza gangs, the series was adapted from a novel by journalist Kazuo Kasahara and was produced by Toei, who earlier rewrote the rules of the yakuza genre with Kinji Fukasaku's Battles Without Honor and Humanity.