Lawyer Shindo Kai is an undefeated ace, also working as a hitman who punishes criminals exploiting legal loopholes. While secretly serving justice, he hides his true identity as the illegitimate son of Gondo Heihachiro, a yakuza boss. When Gondo's group is attacked by the rising Mayhem gang, Kai, having recently lost a case due to sabotaged evidence, investigates the betrayal. His pursuit of the truth leads to a bloody reckoning.
Mashiba Riku , who has a past of betraying his friends and going on the run, he comes to Black Crow leader Kanzaki Kuroto and his right-hand man Masato Yuya. Riku says he is setting up a problem resolution agency called White Knight.
Katsuragi, an elite office worker who fell from a perfect life, drunkenly attempted to jump and commit suicide. Suddenly, he was helped by a mysterious man, Yoda, but that was the beginning of a horrible life of confinement training...
Kaiji (played by Tatsuya Fujiwara) is about to have his life changed. The thrill is beyond anything he, or most people, have experienced. The adventure is not without risk and danger however. He is given four games, which are challenges, and include life and death situations. The film follows its prequels and things will get both mental and physical.