Just before 3 a.m. on December 14 of last year, a 43-year-old member of the Yamaguchi-gumi was assaulted by a 20-person group inside a hostess club in the Roppongi entertainment area.
The gang member received a serious wound to the head from being hit by a beer bottle. Three others were also injured.
The former leader of Dragon is currently a member of the Sumiyoshi-kai organized crime group. According to investigators, the suspect was involved in a dispute with the victim and a former member of the Yamaguchi-gumi, who was present at the time of the assault and the intended target.
Dragon, based in Tokyo, is an affiliate of the now defunct Kanto Rengo bosozoku group. Dragon’s core membership is comprised of second- and third-generation returnees from China who came to Japan after the end of World War II.
In November, officersarrested Sumiyoshi-kai member Shunsuke Ishimaru, 32, on assault charges, but he was later released.
The former suspect is also reportedly a former member of Kanto Rengo. The Sumiyoshi-kai is known to routinely enroll former members.