The flavour of the popular King of Minami series , starring Riki Takeuchi, is back after 15 years. A new story of a man who judges evil not with violence but with the law in order to achieve retribution. Six months after serving a nine-year prison sentence for murder, a man appears in Minami, Osaka . He is joined by like-minded lawyers Sugiyama and private detective Shimizu, who cut their way into a fraudulent medical trial at a university hospital. Eventually, the dark side of the hospital's management comes to light...

The man is trying to get close to Gondo, the leader of the Kansai region, to avenge his old friend Shiraishi, who was killed by Gondo, and himself, who was framed by Gondo. However, Osaka Police Inspector Okura warns the man that he is dangerous. Meanwhile, a woman is defrauded and comes to the Sugiyama Law Office for help.

Under the dark fixer Gondo, there was the martial artist Okita and another one-armed man with brains. His name was Kamiya Shuji, known as the 'Lizard of Minami'. Then, Samejima and his team get an important clue to uncover Gondo's crimes. Samejima then confronts Kamiya.

Samejima receives advice from a young man who has been the victim of a rip-off bar. When he tracks down the perpetrator, the bar manager, he is told that he himself is in debt hell and has been forced to work "part-time in the dark". The existence of 'social network dirty money' is revealed in the pursuit of the truth. The Minami underworld emerges in the background.