Overview of the Criminal Underworld

The yakuza and criminal underworld in Chainsaw Man represent the dark underside of the devil contract economy, where organized crime exploits supernatural power for profit without the constraints that govern official organizations like Public Safety. Criminal organizations have long recognized that devil contracts offer a shortcut to power that conventional weapons cannot match, and they have integrated devil-based capabilities into their operations with ruthless efficiency. From trading Gun Devil flesh on the black market to deploying contracted devils against rivals, the underworld's exploitation of devil power creates a shadow economy that operates parallel to and often in conflict with official devil-hunting institutions.

The relationship between the yakuza and devils is fundamentally different from that of Public Safety hunters. While official hunters maintain contracts with devils for defensive purposes and exercise institutional oversight, criminal organizations pursue devil power for offensive, profit-driven objectives without any accountability. This lack of oversight leads to catastrophic incidents like the Zombie Devil outbreak, where a yakuza contract spiraled out of control and threatened to overrun Tokyo. According to the Chainsaw Man Fandom Wiki, the yakuza's devil operations were eventually targeted by both Public Safety and rival supernatural forces, leading to their systematic dismantling throughout Part 1.

The Zombie Devil Incident

The Zombie Devil incident serves as the series' most dramatic example of criminal devil exploitation gone wrong. A yakuza group contracted with the Zombie Devil to gain an army of undead soldiers, intending to use them for territorial expansion and intimidation. The contract allowed the yakuza to transform anyone they killed into zombie servants, creating an exponentially growing army that quickly spiraled beyond their control. The incident began when the yakuza attempted to collect a debt from Denji, triggering a chain of events that led to the zombies overrunning large portions of the city.

Denji's intervention during the Zombie Devil incident marked the beginning of his career as a devil hunter and established the pattern of his relationship with organized crime. After being betrayed by the yakuza who had employed him as a debt collector, Denji transformed into Chainsaw Man and single-handedly dismantled the zombie army. This incident had far-reaching consequences: it destroyed the yakuza's most powerful weapon, demonstrated the Chainsaw Devil's capabilities to the world, and led to Denji's recruitment by Public Safety. The Zombie Devil itself was devoured by Chainsaw Man, permanently erasing the concept from existence and demonstrating the erasure power that would become central to the series' larger conflict.

The Gun Devil Flesh Trade Network

Beyond direct devil contracts, the yakuza's most significant role in the supernatural underworld was as distributors of Gun Devil flesh. Following the Gun Devil's 1984 attack, its scattered fragments became the most valuable commodity in the supernatural world, and the yakuza positioned themselves as key intermediaries connecting international suppliers with Japanese buyers. This trade network spanned across national boundaries, linking Japanese criminals with arms dealers, rogue nations, and private collectors from around the world. The yakuza's distribution network made them significant players in the global supernatural weapons economy, giving them influence far beyond what their size and conventional power would suggest.

The Gun Devil flesh trade operated through a complex web of intermediaries, smugglers, and corrupt officials. Fragments were smuggled into Japan through various channels, stored in secure locations, and sold to the highest bidders. The black market price of Gun Devil flesh fluctuated based on fragment size, purity, and current demand, creating a volatile but extremely lucrative market. Katana Man's involvement with the yakuza was directly tied to this trade, as his hybrid transformation was enabled by Gun Devil flesh that the organization controlled. The dismantling of this trade network became a priority for Public Safety, as unregulated Gun Devil fragments posed an unacceptable risk to national security.

Katana Man and the Hybrid Connection

Katana Man represents the most dangerous outcome of the yakuza's involvement with devil power: the creation of a hybrid through the combination of Gun Devil flesh and human determination. As a yakuza member who merged with the Katana Devil, Katana Man possessed regenerative abilities, a transforming blade arm, and the same fundamental hybrid nature as Denji. His motivation was revenge against Denji for killing his yakuza superiors, making him a personal antagonist driven by the criminal underworld's code of retaliation. The Katana Man arc demonstrated that the yakuza's experiments with devil power could produce threats that rivaled anything Public Safety had encountered.

The connection between the yakuza and hybrid creation raises disturbing questions about how many other criminal organizations are attempting similar experiments. If the yakuza could create a hybrid through Gun Devil flesh and the right procedures, other groups with access to fragments could potentially do the same. This suggests that the underworld's devil experiments may produce even more dangerous results in the future, as criminal organizations continue to push the boundaries of what is possible with devil power. According to Wikipedia's Chainsaw Man analysis, the proliferation of hybrid technology through criminal channels represents one of the series' most troubling unresolved issues.

Akane and the Snake Devil Conspiracy

Akane, a devil hunter who worked with the yakuza, represents the corrupting influence of the criminal underworld on official devil-hunting institutions. As a contractor with the Snake Devil, Akane possessed the ability to consume other devils and manifest their powers, making her a formidable operative who could access multiple abilities through a single contract. Her involvement with the yakuza demonstrated how the promise of power and profit could lure even trained hunters away from their official duties. Akane's contract with the Snake Devil eventually led to her consuming the Ghost Devil after Himeno's sacrifice, a pivotal moment that highlighted the consequences of unchecked devil power in criminal hands.

The Snake Devil conspiracy revealed the depth of the yakuza's infiltration of legitimate institutions. Akane was not a random criminal but a trained hunter who chose to work with the underworld, suggesting that the yakuza had cultivated relationships within Public Safety and other official organizations. This infiltration allowed the criminal underworld to access intelligence, resources, and operational capabilities that would otherwise be beyond their reach. The Snake Devil conspiracy was ultimately uncovered and neutralized, but it exposed vulnerabilities in the institutional framework that the series suggests may persist long after the specific conspirators are dealt with.

The Economics of Devil-Based Organized Crime

The yakuza's involvement with devils represents a rational economic decision within the Chainsaw Man universe. Devil contracts provide uniquely powerful tools for intimidation, enforcement, and elimination of rivals. Gun Devil fragments are among the most valuable commodities in the supernatural black market, with prices that rival or exceed those of weapons of mass destruction. The criminal underworld recognized early that controlling devil power was the key to economic dominance in a world reshaped by the Gun Devil incident. This economic incentive drove the yakuza to invest heavily in supernatural capabilities, creating a parallel power structure that rivaled legitimate institutions.

The underground economy of devil power operates on principles of supply and demand, with devil contracts functioning as a service industry. Devils provide power in exchange for sacrifices, creating a marketplace where brokers connect contractors with devils willing to make deals. The yakuza positioned themselves as intermediaries in this marketplace, controlling access to devils and taking a cut of every transaction. This economic infrastructure, while mostly dismantled by the end of Part 1, represents a sophisticated understanding of how supernatural power can be monetized within a criminal framework.

The Zombie Devil: Organized Crime's Ultimate Weapon

The Zombie Devil incident represented the yakuza's most ambitious attempt to weaponize supernatural power. By contracting with the Zombie Devil, the yakuza gained the ability to create an army of undead soldiers — mindless, fearless, and endlessly replaceable. This capability would have given the yakuza overwhelming superiority over both rival criminal organizations and law enforcement, potentially establishing them as the dominant power in Japan. The Zombie Devil's power to convert victims into zombies with a single scratch made it the perfect tool for asymmetrical warfare against any opponent.

The defeat of the Zombie Devil by Denji was a catastrophic setback for the yakuza's supernatural ambitions. Not only did they lose their most powerful weapon, but the zombie infection was consumed by Chainsaw Man's erasure ability, permanently removing the concept of zombies from existence. This created a unique problem for the yakuza: they had invested everything in a power that could no longer exist. The permanent erasure of the Zombie Devil concept demonstrated the existential risk of relying too heavily on any single devil's power, as the Chainsaw Devil's erasure ability could render entire categories of supernatural capability permanently unavailable.

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