QRD is niggers in the army were raping, like they did everywhere in the war, and the villagers were pleading to make it stop. The military continued to allow their niggers to rape, like they did everywhere in the war, so the villagers took matters into their own hands. They killed the niggers and hid them in a cave, and the cave became known as nigger cave. Pretty sure the wiki will still pop up if you search Nigger Cave Japan.