Ihara's underling, with whom he created a disturbance in Elnard.
Yakuza 4 Edit
When Akiyama arrives at the club Mishima attempts to attack Akiyama after ignoring his warnings, but he is knocked out, and Ihara is forced to fight alone. After his defeat, Mishima is in a room adjacent to the Seiwa Clan's main office and by chance overhears the phone call announcing Ihara's death. Realising his life is in danger, Mishima goes into hiding. Tanimura offers to take him into police protection, planning to root out the traitor within the police force. Tanimura meets him in a warehouse near the dock, and as he promises him protection Mishima is shot and killed by Sugiuchi.