Jyu-Oh-Sei Planet/Beast King Comp Series

In the distant future, humanity has migrated into space to settle in the Balkan System, leaving behind them a dying Earth. With the loss of their native home, the race has suffered. Safety is an illusion…

Their parents murdered and their easy life at an end, young twin brothers Thor and Rai find themselves jettisoned off-world and abandoned to their fate: Chimaera, a hostile planet where only the worst criminals are sent to die. With extreme temperatures and carnivorous plants, it is a world ruled by brutality, a place where mankind has been reduced to a savage state of survival. And the only hope of escape lies in conquering the planet and its peoples, to rise above them all as The Beast King.

Boy must become man and man must become beast. Death is the only other option.