En has no prospects as a child of the slumsâhe ekes out a living by selling the scrap cyborg augmentations he scavenges to anyone who will buy. But when he's forced to go through some unethical experimentation, he transformsâmaking him eligible to become a fighter in the only thing that matters in this bleak world: The Rokudo Tournament! (Source: Kodansha USA) Note: Includes 1 extra chapter.