The screenplay by Kazuo Kasahara is based on a concept by Norimichi Matsudaira, Naoyuki Sugimoto and Kyo Namura.

[3] Kuroiwa, a police investigator born in Manchukuo, is cracking down on yakuza business but his rough methods often get him in trouble with his superiors and he is transferred to a new beat in Osaka.

The Nishida family tells underboss Matsunaga's half-Korean wife Keiko to convince Kuroiwa to take their side.

Kanai of the Yamashiro family confronts the Nishida yakuza about planting a cop in their gambling house and a shootout erupts.

Kuroiwa also finds that the association is run by Sanko enterprises, a legit front for the Yamashiro family, so he suggests that Chief Akama could investigate Kusumoto to squeeze him on charges of extortion or fraud and get him to return the huts so that the debtor could sell them and get the money to pay Iwata.

A series of violent attacks are exchanged between the two families and eventually the riot police are called in to guard the leaders and headquarters of each organization and set up roadblocks.

Kuroiwa taps Teramitsu's phone and overhears details about the deal but he is discovered and injected with what they call a truth serum used by the nazis and he tells them the location of Iwata's hideout.

Keiko injects him with heroin to make him settle down, then points a gun at him and accuses him of betraying her and Iwata but the bullet only hits him in the arm.