In Hokkaido, it is rumored that there is a stash of hidden gold. This gold was supposedly stolen by a man who killed the original Ainu owners; and before being captured and imprisoned by the police, he hid it in a secret location. In order to relay the gold's location to his comrades on the outside, he tattooed the map on the bodies of his cellmates and promised them a share of the gold—provided they managed to escap...