The West Yakuza were a mafia group who were rivals to the East Yakuza. They were located on the West side of Takoshima City.
The West Yakuza was led by Yamanosuke Hiroto. The West Yakuza were originally allies with the East Yakuza until Kenji Mojo said that his wife was prettier than Hiroto's. Hiroto then sent a disguised Crypto to lure Kenji to a trap, but was unsuccessful when the West Yakuza traitor told the East Yakuza his plans and the traitor was killed in his place. The West Yakuza didn't meddle in Furon affairs until they claimed The Cult of Arkvoodle land for themselves, though they were repelled from the area. Both Yakuza factions were dealt a heavy loss when Crypto killed both Hiroto and Kenji under the KGB's orders because they apparently stole their thunder as the bad guys. The KGB then took control of both Yakuza factions.
The West Yakuza were identified by their dark jackets and sunglasses. Each member carried an assault rifle and they all rode around in trucks. If an East Yakuza was nearby, the West Yakuza then engaged them in a firefight.