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Yakuza group and drug cartel based in Kyushu

The Dojin kai (道仁会) is a yakuza organization headquartered in Kurume, Fukuoka, on the Kyushu island of Japan, a designated yakuza syndicate, with approximately 320 members. born 1934). Seijiro Matsuo, the Secretary General of the first generation Dojin kai, succeeded as the president in 1992. In the same year, 1992, the Dojin kai was registered as a designated boryokudan group under the Organized Crime Countermeasures Law.

Very much like other yakuza groups based in the northern Kyushu region such as the Taishu kai and Kudo kai, the Dojin kai has been noted for its aggressive and violent nature, causing numerous bloody conflicts with other yakuza groups. Notable ones include the Yama Michi War (, 1986–1987), where the organization substantially expelled the largest known Yamaguchi gumi syndicate from the northern Kyushu area. Another notable one is a brief conflict that occurred in 1983, with the Kanto based large yakuza syndicate Sumiyoshi Union, in which a majority of Dojin members moved to Tokyo and had been hiding out around Tokyo with the plan of slaying all of the Union's 76 senior bosses until the Union made a conceding offer of peaceful resolution (teuchi). The Dojin kai is noted for having been isolated in the yakuza world in an uncanny way, in contrast to most other yakuza organizations which usually have at least one ally (sakazuki shared "brother" organization). In one notable anecdote, during the time of the Yama Michi War, there were several offers of help from other organizations but the Dojin kai reportedly rejected all of them. The Dojin kai is a member of an anti Yamaguchi fraternal federation, the Yonsha kai, formed with three other northern Kyushu based independent yakuza syndicates, the Kudo kai, Taishu kai and Kumamoto kai, More than five Dojin offices in Kurume and Fukuoka were attacked with bombs and firearms on May 21 of that year, and soon after that, on 24th, Seido kai's Jinsei group headquarters office in Chikugo was totally destroyed, apparently by Dojin kai's bombs. On June 13, 2007, Zenji Tsurumaru was killed. On June 19, Hidenori Irie was killed. On August 18, the leader of Dojin kai, Yoshihisa Onaka was killed. On November 8, a civilian Hiroshi Miyamoto was killed by mistake while receiving treatment at a hospital. On November 12, Shigeki Koga was killed. On November 27, Yoshikazu Matsuo, one of the chairmen, and his driver were killed. Both groups announced a cease fire on December 18 and on February 5, 2008, the war reportedly ended. The Fukuoka Prefectural Police discovered that the Seido kai built a cenotaph in July 2009 in Omuta to pay tribute to their casualties. The names inscribed on its surface not only included those of Seido kai members but also included those of Dojin kai members. This cenotaph, however, disappeared by early 2011. The Dojin Seido war has been escalating since the late 2000s, especially in 2011, when they started using military machine guns and tossing grenades at each other. Many Seido members have escaped from Kyushu since the late 2000s, building an eight story bulletproof building in Taito, Tokyo as their new base. The first Seido president, Chojiro Murakami, was arrested in Ibaraki Prefecture. Kazuma Umeki, one of the top underbosses in the Seido kai, was attacked with a 10 ton dump truck driven by a Dojin yakuza, and in April 2011, two Seido seniors were shot with a revolver in Imari by a Dojin hitman, and Sueharu Matsunaga, the head of the Seido's Matsunaga group, was killed with a bomb.

Sometimes informally and mockingly dubbed the "Dojin Pharmacy" (Dōjin Yakkyoku), the Dojin kai's activities, just same as its splinter group Seido kai's, allegedly largely consist of drug trafficking. [[File:Chikugo river up20060426. jpg|thumb|right|Primarily based in the Chikugo region of Fukuoka, the Dojin kai has its known branch offices in three other prefectures. This group had used a small island located in Kagoshima Prefecture as a smuggling base, and for example in 1986, this group smuggled approximately of methamphetamine—estimated retail price of nearly US$1 billion—from Taiwan.

The Dojin kai has been known for its strong anti authority, anti police stance since the 20th century, however at the same time the Dojin kai has allegedly developed some relationship with local authorities, and it has actually been uncovered, as, in the early 2000s, the Fukuoka Prefectural Police headquarters disclosed that its classified information had leaked out to the Dojin kai via its branch police departments based in the Chikugo region including Kurume.