The Japanese thieves were two criminals who ran afoul of the Ishimura Clan.
While breaking into an unknown location in Ishimura, one of the thieves expressed concern that there might be an alarm. The other dismissed his worries by stating that the people of Ishimura were too provincial to be a match for them. Coming out the location with sacks of money, they were confronted by many members of the Ishimura Clan. After putting up a feeble resistance, they were captured by Kai, Yama, and Sora. Hiroshi took them off to jail as the townspeople jeered their defeat.