The was a yakuza organization based in Fukuoka Prefecture on the Kyushu island of Japan, with an estimated 150 active members. Headquartered in the southern Fukuoka region of Omuta, the Kyushu Seido-kai maintains its offices in five other prefectures including Tokyo."Boryokudan Situation in 2010" , April 2011, National Police Agency

Since its formation, the Kyushu Seido-kai has been known for its blatant armed conflicts with its former parent syndicate, the Dojin-kai,"Gangster tied to slaying in Saga hospital arrested", 26 November 2007, The Japan Times involving various hazardous weapons such as automatic firearms (especially the AK-47), petrol bombs and hand grenades.

While violently feuding with the Dojin-kai, the Kyushu Seido-kai has caused deaths among several innocent civilians as well as numerous yakuza members,"Firing on a car belonging to a Dojin-kai insider, possibly from a conflict with the Seido-kai" , 30 March 2011, Yomiuri Shimbun and because of that, despite being a relatively recently established group, the Kyushu Seido-kai has been a designated yakuza group since 2008."National Police Agency searches the Kyushu Seidokai's office, for blackmail among others", 31 October 2008, Sankei Shimbun

In October 2013, the organization changed its name to Namikawa Mutsumi-kai, and in 2015, it was renamed Namikawa-kai.

History The Kyushu Seido-kai launched in 2006 as the Dojin-kai's splinter group"Japan: Residents go to courts to evict yakuza", 26 August 2008, The Guardian led by the Omuta-based Murakami-ikka clan, after the long-time Dojin-kai boss Seijiro Matsuo announced his resignation, sparking a war of succession."The town that took on the yakuza", 9 September 2008, The Independent In 2007 a Dojin-kai member attempted to murder a Seido-kai member, but ended up killing an innocent bystander. The Kyushu Seido-kai ended up receiving official registration as a designated yakuza group under the Organized Crime Countermeasures Law on February 28, 2008."Boryokudan Situation in 2007" , April 2008, National Police Agency

In 2011, the Seido-kai's feud with the Dojin-kai escalated,"Shot : One hurt in the Dojin-kai President's house, Kurume", 26 August 2011, Mainichi Shimbun and many Seido members were killed by the Dojin-kai; two Seido seniors were killed by alleged Dojin-kai's grenades in Omuta (April),"Explosive in car kills ex-gang boss, brother", 8 April 2011, Yomiuri Shimbun one Seido member was stabbed to death in Ogi, Saga (April),"Seido-kai member was stabbed to death immediately after getting off his car" , 21 April 2011, Sankei Shimbun and one Seido senior was shot to death in Imari, Saga (April)."Hospital murder, Dojin-kai member was arrested" , 10 July 2011, Yomiuri Shimbun

Condition The Kyushu Seido-kai is one of the five independent Fukuoka-based designated yakuza syndicates, along with the Kudo-kai, the Taishu-kai, the Fukuhaku-kai, and the Dojin-kai."Police of Japan 2011, Criminal Investigation : 2. Fight Against Organized Crime" , December 2009, National Police Agency The Kyushu Seido-kai maintains its offices in six prefectures; Fukuoka, Saga, Nagasaki, Kumamoto, Yamagata,"Kyushu Seido-kai as a shitei boryokudan, The Fukuoka Prefectural Public Safety Commission started the procedures", 27 December 2007, Chiba Nippo and Tokyo.

In 2008, the Kudo-kai's third-generation president Hideo Mizoshita died and his funeral was attended by many yakuza magnates representing their respective syndicates from all over the country. The Seido-kai was the only designated yakuza syndicate absent from this event.The Sixth Yamaguchi-gumi Complete Databook 2008 Edition : "The funeral of the Fourth Kudo-kai Honorary Adviser Hideo Mizoshita" (p.192–197), 1 February 2009, Mediax,

The second president Namikawa has allegedly maintained a close relationship with Kunio Inoue. Inoue is the president of the fourth-generation Yamaken-gumi, an affiliate of the largest-known Yamaguchi-gumi syndicate."Increasing dangerousness of the Yamaguchi-gumi's internal conflicts after the Elimination Strategy (The Commissioner General)", 19 December 2010, Atsushi Mizoguchi, Gendai Business

Activities The Kyushu Seido-kai's illegal activities have allegedly included loansharking and methamphetamine trafficking."Kyushu Seido-kai as a shitei boryokudan, The Fukuoka Prefectural Public Safety Commission started the procedures", 27 December 2007, 47 News, Kyodo The Seido-kai was allegedly the largest drug trading division of the Dojin-kai, as rumored by some local Omuta in-the-know men, hence the informal dub name of the "Seido Pharmacy". Even the 55-year-old founding president Murakami was arrested for methamphetamine possession.

On June 11, 2013, Kyushu Seido-kai announced the end of its gang war with Dojin-kai as well as its dissolution.

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