A slum where criminals' descendants live... People beyond the border look down and discriminate against them as "tribal people". Ludo, an orphan boy, lives in the slum with his foster parent, Legt, and makes a living using his extraordinary physical abilities. However, one day, he is accused of a crime that he doesn't commit, and is thrown into the "abyss" that even the slum people fear. (Source: Pocket Magazine, translated)