Police in Aichi Prefecture have struck at the operational heart of what they believe was a sophisticated underground gambling network run by Inagawa-kai, one of Japan’s most powerful organised crime syndicates. The raid on offices in Yokohama marks a significant escalation in efforts to dismantle the gang’s illegal slots empire across central Japan.

Major Yakuza Syndicate Under Pressure

Inagawa-kai isn’t some minor outfit. With an estimated 1,600 members and roots stretching back to 1949, it’s one of Japan’s three dominant yakuza organisations, primarily operating across the Tokyo-Yokohama corridor. Their traditional activities span gambling operations, drug trafficking, extortion, and blackmail, making them a priority target for law enforcement.

The heavily armed police operation targeted offices investigators believe served as the command centre for multiple illegal slot machine parlours. The trigger for the raid was the bust of a gambling venue called Royal in Sakae, Nagoya’s entertainment district, back in April. That initial operation netted three arrests, including 39-year-old Masato Hori, identified as the group’s ringleader.

Profitable Network Across Aichi

This wasn’t a one-shop operation. Police evidence suggests Hori and his associates ran illegal slot parlours in at least four other locations across Aichi Prefecture, generating minimum profits of 28 million yen, over $177,000. That’s likely conservative. Authorities reckon the actual take was considerably higher.

The three arrested face gambling-related charges, potentially including encouraging habitual gambling, a serious offence under Japanese law. More to the point, investigators believe a portion of those proceeds fed directly into funding Inagawa-kai’s broader criminal operations. This is more than just an illegal gambling case.

Coordinated Crackdown Intensifies

Police forces in both Kanagawa and Aichi are ramping up pressure on the syndicate. In a separate but related operation, Yokohama officers arrested two gang members, aged 44 and 33, for allegedly dealing banned stimulants in the Tsurumi Ward. The men were caught red-handed selling drugs to a 45-year-old customer in a hardware store car park, a location they’d reportedly been using as a dealing spot since December.

Authorities are keeping details close to the chest, refusing to disclose what the suspects have told investigators to avoid jeopardising ongoing operations. That suggests this is part of a larger, coordinated effort rather than isolated incidents.

Timing and the Legal Casino Push

The timing of this crackdown isn’t coincidental. Aichi Prefecture is preparing a bid to build one of Japan’s integrated casino resorts, part of the government’s ambitious plan to establish three legal IR developments nationwide. Tokyo has already greenlit MGM Osaka, scheduled to open in 2030, but only two additional licences remain available.

For Aichi’s bid to succeed, demonstrating effective control over illegal gambling is essential. No regional government wants to pitch for a major legal casino project whilst organised crime runs unregulated slots parlours down the road. This aggressive stance against Inagawa-kai sends a clear signal that Aichi is serious about cleaning house before welcoming legitimate international operators.

The investigation remains active, with police promising further action as they continue unravelling the syndicate’s operations across the region.