Sympathy for the Underdog (1971)

In the teeming black markets of postwar Japan, Shozo Hirono and his buddies find themselves in a new war between factious and ambitious yakuza.

Two New York cops get involved in a gang war between members of the Yakuza, the Japanese Mafia. They arrest one of their killers and are ordered to escort him back to Japan. However, in Japan he manages to escape, and as they try to track him down, they get deeper and deeper into the Japanese Mafia scene and they have to learn that they can only win by playing the game—the Japanese way.

A barkeeper saves a Yakuza boss' life and thus makes his way up in the organization. However, his fear of nothing soon causes problems.

When a mysterious stranger muscles into two rival yakuza gangs, Tokyo's underworld explodes with violence.

After serving time, a defiant street thug is incensed to find his town overrun by two yakuza factions. He gathers his crew and takes them on.

Murakawa, an aging Tokyo yakuza tiring of gangster life, is sent by his boss to Okinawa along with a few of his henchmen to help end a gang war, supposedly as mediators between two warring clans. He finds that the dispute between the clans is insignificant and whilst wondering why he was sent to Okinawa at all, his group is attacked in an ambush. The survivors flee and make a decision to lay low at the beach while they await further instructions.

When George Tanner does business with high-ranking Yakuza Tono, Tono kidnaps his daughter, and George summons his old friend, private eye Harry Kilmer, to Japan to investigate.

When Nick Davis leaves prison after one year in solitairy, he is hired to operate a forklift in a warehouse in the harbor owned by the Japanese Yakuza patriarch Isshin Tendo. The place is assaulted by the Italian Mafia lead by Dino Campanela and Nick rescues and saves the life of Shuji Sawamoto, who is the representative of Yakuza interests in America. Shuji hires Nick to work for Yakuza and becomes his godfather in the family after his oath to join Yakuza. However, Nick is a lonely FBI undercover agent assigned to penetrate the criminal organization. When the FBI discovers that Campanela is organizing a massive attack to destroy the Yakuza, Nick's boss Littman calls off the operation to leave the dirty work to the Italian Mafia. But the connection of Nick with Shuji and his goddaughter Yuko forces him to help his Japanese family.

After yakuza boss Kurata dissolves his own criminal empire, a rival kingpin offers a position to Kurata's top operative, Tetsuya "Phoenix Tetsu" Hondo. When the fiercely loyal Tetsu declines, Otsuka taps unstoppable Tatsuzo the "Viper", a ruthless gun-for-hire, to assassinate him. As the Viper trails his target through the countryside, the agile Phoenix Tetsu grows concerned that one of his former associates has betrayed him.

Ryūichi and his small gang of Triad vie for control of the Japanese underworld in a crime-ridden Shinjuku quarter while Detective Jojima tries to bring it down.