Sadao is a teenager from the Land of the Sun who is fixated with the idea of avenging his brutal, cannibalistic father's killer. Possessing blind rage and steely determination, he managed to locate his father's killer by a chance encounter and from then on, stalked the individual with murderous and dangerous intent; biding his time to strike, though his unhealthy obsession with Densetsu would eventually go further than even revenge, as darker motives began to sink in.