Mars, the Knight of the Golden Serpent, the 13th sign of the zodiac and master of the Sanctuary tries to kill a baby who is saved by Seiya, the Gold Saint of Sagittarius. They fight and with the help of Athena, the villain is defeated. Disappears after the battle Seiya and Saori takes care of the baby, named Kouga.Thirteen years pass and Mars reappears to attack Athena. Even wearing bronze armor of Pegasus, Kouga, the new protagonist of the series, is not able to cope with the villain. Saori disappears and the new hero to your search. On the way he meets Souma, the Bronze Horseman Lionet (Leo Minor) and together they defeat an envoy of Mars.