After losing his brother and parents to the tyrant Zure, Marg survives alone on the desolate planet Gishin. Joining a rebel group to overthrow Zure, he finds love with Ruru, Ura's daughter. But as the organization crumbles, Marg is captured and brainwashed into Zure's army. His ultimate desire to reunite with his brother is fulfilled in a surprising duel. In this OVA, key characters like Gaia, God Mars, and the Gishin robot Zeron undergo redesigns, focusing on Marg's tumultuous journey on Gishin leading up to episode 19's pivotal events.