Rokushin Gattai GodMars: Juunana-sai no Densetsu

Marg was deprived of his little brother, Mars, by Zure, and lost his parents.

Therefore, he was living alone on the planet, Gishin.

He became a member of a guerilla to riot against the dictator Zure, and he fell in love with Rose, the daughter of the leader, Ura.

However, the organization was destroyed.

He was trapped by Zure, and he was brainwashed to become a soldier.

Then, his long cherished wish to meet his brother again was granted... when he has to face him in a duel.