Jin-Shan Lei, 39, who is already under prosecution for violating stimulants control laws, and six others were taken into custody for spraying the contents of three fire extinguishers inside a massage parlor in Funabashi City at approximately 2:20 a.m. on March 12 of this year.
According to police authorities, six of the suspects were requested by the manager of a rival massage parlor, Suiichi Kanzaki, 29, to carry out the attack. Kanzaki was also arrested. All seven suspects have admitted to the allegations.
The owner of the damaged club was forced to cease operations for two weeks due to the damage.
Dragon, based in Tokyo, is an affiliate of the Kanto Rengo (関東連合) 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.