Sumiyoshi-kai

The Sumiyoshi-kai appears as a criminal organization whose income depended not only on intimidation but also on finding leverage in property markets and struggling businesses. In Kaneko’s account, its operations joined coercive pressure to ordinary commercial transactions, making the organization’s economic reach difficult to separate from the legal economy around it.

Property, extortion, and corporate schemes

At the organization’s height, Kaneko said, the Sumiyoshi-kai helped drive up land prices in return for kickbacks from realtors or banks. It also made money by pressuring tenants to leave homes and apartment buildings that would be more valuable on the open market without them. Another tactic was to disrupt public auctions of seized properties by placing members in the buildings. In some cases this helped the former owner buy the property back cheaply; in others, the organization acquired the property itself and resold it through a front company. Kaneko also identified illegal waste disposal and protection payments from the sex industry in Omiya among its revenue sources.

He described extortion as the organization’s largest source of cash and cast it as a business built around information: companies or businessmen with embarrassing secrets could be made to pay to keep those secrets out of public view. The same appetite for leverage could draw the organization into companies already in financial trouble. Some such businesses cooperated, expecting a share of the proceeds; the Sumiyoshi-kai used their real estate to secure loans from midsize banks, left the loans unpaid, and allowed the companies to collapse. When the properties were seized, members could interfere with the ensuing auction, acquire land and buildings at low prices, and resell them or take a cut when a third party bought them. The sequence turned a company’s distress, its property, and the foreclosure process into successive opportunities for profit.

Front companies and diversified operations

Kaneko’s account extended beyond land and extortion to a web of businesses that gave the Sumiyoshi-kai access to different markets. It operated temporary staffing agencies and loan-sharking businesses, as well as an insurance company used to submit false claims against legitimate insurers. A collection agency recovered overdue debts for lawful consumer-loan companies, while other operations scalped tickets and ran pawnshops that trafficked in stolen goods. The organization also had a talent agency supplying young women to porn producers; Kaneko said the women were paid well and were not coerced.

Other ventures ranged from retail to logistics. The Sumiyoshi-kai ran shops selling adult goods and teenage girls’ used underwear, and provided transportation, trucking, shipping, and security for large events. In construction, it could win a contract and subcontract all the work, keeping the difference between the contract payment and what it paid the subcontractor. These arrangements placed the organization not outside ordinary commerce but within its supply chains—as a contractor, service provider, lender, or intermediary, able to profit from the gap between a transaction’s public appearance and its actual operation.

A purported political organization offered another way to disguise payments. It received a tax break and solicited subscriptions to an expensive newsletter from companies, turning what might otherwise look like extortion into a formal subscription transaction. Taken together, the businesses described by Kaneko show how the organization could draw revenue from both illicit activity and commercial forms that appeared routine, using fronts and intermediaries to make the boundary between them less visible.

Police Intelligence and Internal Rivalry

Kaneko’s account also revealed how the Sumiyoshi-kai’s relationship with police could involve carefully managed exchanges of information. After hearing that Kaneko had described a working relationship with the police, the narrator’s source explained that officers in Anti–Organized Crime Division 1 needed information about yakuza offices, membership, and organizational ties. Rather than formally handing over records, Kaneko would leave materials where officers could notice them while he was occupied, or place them in the trash so they could be retrieved. The arrangement let police obtain information while allowing Kaneko to avoid the appearance of directly supplying it.

The source initially suspected that a rumor about Kaneko bribing a police officer was an attempt by someone inside the organization to bring him down. Two days later, the source identified the person spreading it as Yoshinori Saito, the Sumiyoshi-kai’s number-four figure. Saito had accused Kaneko to a detective without naming the supposed recipient of the bribe, prompting police to search for a mole and putting Kaneko under suspicion within the organization.

The accusation grew out of a deeper dispute. Saito wanted to sell methamphetamine to truck drivers traveling through Saitama, while Kaneko opposed the plan because he feared it could draw their boss, Nakamura, back toward a drug habit he had reportedly had when younger. According to the source, Saito used the police rumor to make the organization regard Kaneko as an informant rather than challenge him openly. The episode exposed how access to police intelligence, internal business disagreements, and factional maneuvering could converge: a charge about cooperation with law enforcement became a means of shifting danger onto a rival.

The Exchange of Information

Kaneko’s account was also part of a negotiated exchange: after listening to his one-hour explanation, the narrator promised to find out what he reasonably could, then declined Kaneko’s offer of a ride to his next destination. That night he relayed the information to his own source, who undertook to investigate and called back two days later with the name of the person behind the allegation against Kaneko. The sequence shows how knowledge of the Sumiyoshi-kai moved through a chain of personal contacts rather than a formal disclosure: Kaneko shared a detailed account, the journalist carried it onward, and the source returned with information about the organization’s internal dispute.