Flaming Heaven: The Dragon returns

A boy with long and black hair and a pair of fierce eyes like dragon appeared in the mecha battle. He was fearless, alert and calm but above all, he was as mysterious as a dark abyss. Facing the so-called “Dragon Slaughter” mecha, this mysterious boy had beaten down his rival completely and won without showing much emotion. What was his story and would the owner of Dragon Slaughter revenge on him?