‘There are still informants in the police force’ Shocking testimony from a member of the fluid crime group “Natural”.

A highly confidential proprietary application was used to cut through investigative information.

The Tokyo Metropolitan Police Department was shaken by this incident.

On November 12, Daisuke Jimbo, 43, an assistant police inspector in the Anti-Gang Division of the Metropolitan Police Department, was arrested on suspicion of violating the Local Public Service Law for leaking investigative information to the illegal scout group Natural, which is considered the largest and most powerful (and deadliest) in Japan. While the police authorities were in the midst of a nationwide crackdown on what they positioned as a Tokuryu (anonymous and fluid criminal group), it became clear that the person at the center of the investigation had been taken in by the other party in reverse.

The suspect was arrested for sending images to the other side of the investigation cameras that had been installed for surveillance purposes at “Natural” related parties. There is a strong possibility that he was also passing on other investigative information and receiving compensation in return.

Natural” has nearly 2,000 members nationwide, mostly young people in their 20s. The group mediates women to brothels and receives illegal introduction fees called “scout backs” from the brothels, and its annual revenue is estimated at 5 billion yen.

The company also exercises strong internal control through violence, and FRIDAY has reported on this situation twice in the past. Whispers of the existence of an inside man have actually been whispered for nearly a year. In late January of this year, an investigative team led by the Tokyo Metropolitan Police Department’s Anti-Gang Division moved in to arrest all of the “Natural” executives, but when they raided the apartment where he was believed to be hiding early in the morning, he had already fled. An investigator recalls.

They had thoroughly marked their targets, including the top executives, and even confirmed their movements at high-class restaurants in downtown Tokyo. However, when it came time to launch the project, all the executives went missing at once. We could only assume that all of our information was missing.

Jimbo, who was arrested, was a key member of this investigation team.

I got the impression that he had always been a womanizer,” said Jimbo, who had been divorced and now remarried. He had a history of divorce and now has a young child with his second marriage, but he was also rumored to be involved with another woman. There were also questions about his sudden purchase of a luxury car and other financial improvements.

How does “Natural” bring in investigators? The most common way is through the intermediary of gangsters.

Jimbo, who was arrested, had been in charge of gang investigations for a long time, and as a so-called “Maruboshi” detective, one of his jobs was to obtain information from inside the gang. The “Natural” is an affiliate of a regional gang, and I hear that he came into contact with a senior member of the “Natural” through an introduction by a gang member who was a close friend of the “Natural”.

Some of the brothels to which “Natural” sends women also have close relationships with police officers, and in some cases, the women are introduced to them. One of the active members revealed on condition of anonymity.

The professional (police) countermeasures are handled by a specialized department, and there is plenty of money for maneuvering. The people on the inside are surrounded by a large amount of money. Once they lose their financial sense, they cannot do without our money. It is the same as a woman who falls into the sex industry. Basically, investigative information is shared only among the executives, and only what is necessary is passed on to the members.

They also have a high ranking member of the police force as an inside man.”

When the Metropolitan Police Department searched Jimbo’s home, they found 9 million yen in cash in a drawer in his room. It is believed that money was regularly handed over in return for investigative information.

Jimbo’s smartphone contained a special app that only members of “Natural” use. It is said to be highly confidential and was developed independently at a cost of tens of millions of yen, using overseas apps as reference.

It has a full range of functions, including chatting, file sharing, and calling, and I use it to communicate with my relatives. The only way to get it is to have someone from the “head office” attend and download it in a special way. Basically, outsiders cannot use it. In an emergency, the app can be remotely deleted from the phone so as not to leave any evidence.

Jimbo left the “Natural” investigation in the spring of this year and has been under voluntary questioning since the summer, and appears to have been under de facto house arrest. However, information about the investigation was still being shared within “Natural” after that. Another active member said.

In September, we heard that a collaborator in the Metropolitan Police Department was going to be exposed. However, information about the investigation is still being leaked. I can’t go into details, but there is a high police official in a certain prefecture in the Kanto region who has had a long relationship with us, and there are multiple routes to the police in major cities across the country. There are still more people on the inside.”

In the application he showed me, he had written down in great detail information about police searches and other information.

There are still others who are being taken in – and there are still others who are being taken in. The police authorities are also aware of the critical situation, and internal investigations are underway, including in rural areas. The Metropolitan Police Department has identified the “Natural” executive who was exchanging information with Jimbo and is tracking his whereabouts.

One senior police official asserted.

‘If it has come this far, we have no choice but to be thorough, even if it means shedding blood. The destruction of the “Natural,” which is the largest and most vicious of the Tokuryu, is our top priority.

Natural contamination” is spreading within the police force. The depth of this darkness is still unfathomable. (Some titles are omitted.) In mid-November, three members were locked up.

From the December 12, 2025 issue of FRIDAY