The East Yakuza were a mafia group who were rivals to the West Yakuza. They were located on the East side of Takoshima City.
Hiroto then attempted to lure Kenji into a trap with the help from a disguised Crypto, but the the West Yakuza had a traitor who filled in the East Yakuza with the info. The East Yakuza joined the Army, the Police, the Black Ninjas and their fellow gangsters in a battle against The Cult of Arkvoodle for their territory. Both Yakuza factions were dealt a heavy loss when Crypto killed Kenji and Hiroto 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 East Yakuza were identified by their white outfits. Each member carried an shotgun or rocket launcher. If a West Yakuza was nearby, the East Yakuza then engaged them in a firefight. Generally, the East Yakuza resented getting a less "cool" cat name as their nickname.