Mr. K is a mysterious man who discloses no information on himself other than that he is a World War II veteran that abhors Japan and its people for the crimes they committed during the war. He soon bumps into Takeshi Yamato who finds out about Mr. K's plans and attempts to stop him. In order to destroy Japan and eliminate his new found enemy Rainbowman, Mr. K creates an army composed mostly of fellow veterans who share his hatred. However, Rainbowman proves to be no weak adversary as he eventually wipes out the entirety of Shine Shine Dan, leaving only Mr. K. Mr. K however managed to escape and fled, leaving behind one last army of cyborgs and the Die Die Gang soldiers, before then escaping to parts unknown. He vowed revenge, however he was never seen or heard from again.