Kazuhiko Murakami

A rebellious former member of the Yakuza decides to turn the Japanese crime world upside down. He starts an organization known as the Tokyo Mafia, a crime syndicate dedicated to overthrowing the old order and establishing a new kind of lawlessness. It isn't long before the two syndicates begin a full-scale war against one another, plunging the city of Tokyo into chaos. (rottentomatoes)

Former hitman Ginya Yabuki (Riki Takeuchi) left the mafia and split somewhat contentiously with his longtime former partner. Years later, that same ex-partner has emerged as the head of a very dangerous crime syndicate and Yabuki is forced to confront his former partner, which may start an all-out war within the Tokyo Mafia. (Ryan Shriver, Rovi)

As the Clan of the Yakuza Reijiro Masaki is dissolved, he finds shelter in the former hostile Todo-Clan. He gets the second leader, because he once spared the life of the leader of the Clan. This, of course, causes displeasure between the other members. Fight and terror start.

When yakuza boss Masaki discovers that Kokubu of the Takeda clan was behind the assassination of Soma, his second in command, he has no choice but to settle things gangster style. Things become complicated when one of the assassins, claiming to have been betrayed by Kokubu, comes to Masaki for protection. (Letterboxd)

Yabuki's old friend returns as a deadly enemy. Blood brothers are driven to bitter hatred as betrayal rips mafia loyalties apart! Only the strong will survive the wrath of The Yakuza. (Amazon)

Ten years after his greatest triumph, Yabuki has lost the Mafia that was once his to rule. But when a young gangster comes to him for guidance, he discovers that the old rage still burns. It's time for Yabuki's final stand and one last blaze of glory! (Amazon)

A small yakuza gang is taken to war by a more powerful rival after a violent bar brawl involving members of both gangs. Young boss, Masaki, must decide whether to disband his dwindling gang or fight. (letterboxd.com)