This is the ninth film in the
Bakuto (
Gambler) series of films that was produced by Toei Studios and starred Koji Tsuruta (except for the film
Gambler Clan, which starred
Ken Takakura in his place). Fukasaku had previously directed
Bakuto kaisanshiki (''
Gambler's Farewell''), the sixth film in the series. Set and filmed in
Okinawa,
Sympathy for the Underdog has similarities to actual real-life events. It was not until several months after the film was released that America gave control of Okinawa back to the Japanese. But yakuza fled to the prefecture in the late 1960s in anticipation of the new business opportunities created once US forces withdrew. This ultimately led to the
Yamaguchi-gumi, the largest criminal organization in the country, leading a ten-year war in Okinawa against other gangs. However, this was only just starting when the film went into production. Inspired by movies about the
French Foreign Legion, "and stories about people who cross national borders and ended up fighting in foreign wars," Fukasaku originally wanted to make a film about yakuza that end up in
Vietnam, but stated that this ultimately proved "impossible." ==Home media==