Ryoji Arai

Ryoji Arai is an animal trader, former partner of Gen Sekine, and wanted man whose shifting ties to organized crime made him both a suspect and a pivotal source in the investigation of Sekine. His story turns on a distinction the inquiry gradually uncovers: Arai was implicated in a separate, older mystery involving his missing wife, but his disclosures about Sekine’s crimes pointed investigators toward Shima instead. Arrested on a fraud charge, Arai entered the case less as a settled explanation than as a route to evidence others possessed.

Identity and Background

Arai’s business history began with animal trading. Sekine’s past put him in the orbit of local gangsters from a young age, though he never became a full member; Arai, by contrast, emerges as a businessman whose transactions and debts brought him into repeated conflict with organized-crime groups. He and Sekine had known one another for roughly a decade. Arai eventually became the public-relations representative for the African Kennel, a dog-breeding business, and the two men worked as business partners before falling out.

Arai’s dealings with the Sumiyoshi-kai help explain why these business ties could carry consequences far beyond an ordinary commercial dispute. He had sold an expensive dog to the head of one of its groups and was supposed to care for it while the boss traveled. Instead, he abandoned the dog and left town with money borrowed from the group, intending to establish an animal-importing business. He had also allegedly run off with a couple of million yen borrowed from Takada. When the Sumiyoshi boss returned to find the dog in poor condition, he vowed to hunt Arai down. Arai’s animal enterprises thus connected him to a network in which a damaged business relationship could become a personal threat.

Flight, Debts, and Return

Faced with the threat from the Sumiyoshi group, Arai disappeared into the countryside, changed his name, adopted a religious life, and began painting Buddhist art. His retreat did not resolve his place in the criminal world. A notice circulated in his name identified him not merely as someone who had left an organization, but as a betrayer who was no longer entitled to membership and was being hunted. The distinction mattered: a routine notice of separation warned others not to shelter or do business with a former associate, while Arai’s notice sought information about his whereabouts and could function as a wanted poster among organized-crime groups. The reporter obtained a copy.

Years later, Arai reappeared and seemed to be working again with Sekine. The apparent return to business was followed by another disappearance, leaving investigators to wonder what he knew about the missing people around Sekine. Arai and Sekine had already fallen out, and the circumstances surrounding Arai’s wife sharpened suspicion. His wife had gone missing before the partnership ended. The reporter suspected that Arai had killed her and that Sekine had helped dispose of her body, but this remained an allegation, not an established finding. The available account emphasizes how difficult it would be to prove a decade-old killing without a body.

Role in the Sekine Investigation

As the investigation stalled, Sekiguchi predicted that the fraud case against Sekine would collapse and identified Arai and Shima, Arai’s driver, as people who might know how Sekine killed Endo and Kawasaki, a waste-management company president. His proposed strategy was to find grounds to arrest the pair, use their accounts against each other, and obtain information that could bring down Sekine. Arai’s connection to Sekine therefore mattered not only as a history of business partnership, but as a possible channel to testimony about the killings.

Arai’s information changed the investigation’s direction. Located by Takada’s second-in-command, the Consigliere, Arai became willing to talk. He revealed that he had played no part in the disappearances of the last four victims. Instead, he said, Shima had been involved. Arai had learned from Shima that Sekine killed Endo and his driver, Wakui, with poison, and that Shima had helped bury them. This separated Arai’s possible involvement in older events from the specific evidence needed to pursue Sekine: what Arai knew about Shima could lead investigators to the person who had helped conceal the killings.

Arrest and Narrative Significance

The police arrested Arai on a fraud charge, not because they expected to prove the suspected murder of his wife. With no body and a decade having passed, even a confession to that killing would be difficult to substantiate. Investigators were more interested in what he could reveal about Shima, whose knowledge could in turn make it possible to build a case against Sekine. Arai’s arrest thus served as an investigative lever: the fraud allegation brought him into police custody, while the value of his testimony lay elsewhere.

His disclosures also triggered a dangerous complication. The Consigliere told Takada about the existence of the tapes on the day Arai was arrested, although Takada had not previously been told about them. Takada immediately called Shima and demanded the location of Endo’s body, threatening that Shima’s own body would need burial if he did not provide it. Shima was caught between that demand and what he knew: there was no body left to produce, because he had helped cut it up and burn it. Arai’s account therefore did more than clarify the division of responsibility. It set off a chain of pressure that exposed the gulf between the evidence investigators sought and the evidence Shima could actually deliver. The record establishes Arai’s arrest and the consequential information he supplied, but does not resolve his ultimate legal fate or establish the suspicion concerning his wife as fact.