Three brothers, Kuroki, Jirō, and Sabu, find themselves pitted against each other as rivals in the underground world of the Yakuza. Jirō, alongside his girlfriend Mizuhara, plots to rob Sabu and his gang, stealing 20 million yen. However, when Kuroki learns of Jirō’s scheme, he journeys to track down his brothers and take the money for his own rival gang.