Peanuts

One of two enigmatic tough guys who win at the track and navigate a brutal underworld. He and Kyotaro respond to debt with street smarts and violence, forming a loose alliance as they confront the Hyakkikai. He participates in the Hyakkikai robbery to help repay Makimura's debt, demonstrating loyalty to friends over strict legality.

The other enigmatic tough guy whose actions mirror Ryuji's blend of cunning and force. He fights with the Hyakkikai, ultimately kills Gori during a confrontation, and escapes with Ryuji and the former Hyakkikai workers. His decisions drive major shifts in the gang dynamics and the pursuit of repayment and revenge.

A member of the Hyakkikai posing as a car dealer who swindles winnings. He is part of the scheme that entangles Ryuji and Kyotaro with the Hyakkikai and contributes to the escalating tension between rival factions.

An elderly fish seller overwhelmed by debts to the Hyakkikai. He attempts to take his own life but is saved by Ryuji and Kyotaro after they rob a Hyakkikai gambling den to fund repayment, illustrating his vulnerability and the human cost of the debt network.

Head of the Kurogane gang who controls the Hyakkikai; she bribes detective Yabe to dig into the robbery and has a controlling, ruthless approach to power. Her relationship to Yukari and the broader conflict reveals the intersections of family, crime, and legacy.

Boss of the Hyakkikai who collects debts but is unable to repay all stolen money to Kurogane. He is beaten by Kyotaro and later killed in a confrontation, symbolizing the brutal consequences of the underworld power struggle.

Kurogane's daughter who has a child with a Black man named George and insists on staying with him, creating a personal crossfire between family loyalties and factional demands. Her presence adds a domestic dimension to the gang warfare.

Kurogane's underboss who is ordered to kill George and coordinates debt-collection schemes. He also supports Takakura's kidnapping of Sugiyama to lure Kyotaro, highlighting the methodical and ruthless planning within the gang hierarchy.

A businessman who hires Ryuji and Kyotaro to collect a large debt from Yukichi Sugiyama, showing how front-facing commerce intersects with coercive debt collection in the criminal underworld.

A debt debtor who is also tied to drug smuggling; his abduction by Takakura and the subsequent drug-switching operation drive much of the plot’s tension and risk for the protagonists.

Mrs. Makimura's daughter who answers Kyotaro's calls and receives roses at work, reflecting the personal connections that exist within the criminal world and the impact of debt and violence on ordinary people.

A detective bribed by Kurogane to investigate the robbery and who connects Ryuji and Kyotaro to Makimura, illustrating how law enforcement can be entangled with crime and corruption.

Kurogane's enforcer who claims a brother was murdered by a rival gang; Kyotaro later kills Muto, marking another turning point in the cycle of vengeance and retribution that drives the plot.