Snake of Violence (2013)

In Osaka, three troubled young kids, Kanako, Atsushi and Kenji, are hanging out together all the time. One day Kenji who lives in an orphanage is sold to a yakuza and their friendship has to come to an end. 25 years later, Kanako is married to Atsushi who is an incompetent yakuza. They have 3 daughters. Kenji is a competent unbeatable yakuza. Atsushi, who sucks at everything, for the first time gets a dangerous mission to kill a thug who has attacked the office of his yakuza group. Kenji, who has advanced to the first lieutenant position, by mistake kills a dumb-ass son of the head of Tokyo Yakuza, which triggers a battle between Osaka and Tokyo Yakuzas. Then, Kenji meets Atsushi in 25 years.