In his journeys, Desmond is repeatedly attacked by demons. In the process, his companion Rolf (バーン, Bān) from "Dragon Knight II" and the sorceress Luna (ルナ) from "Dragon Knight" join him. He dreams of a woman who later turns out to be the goddess of light Althea (メシア, Meshia). She and the god of darkness Deimos (ディード, Dīdo) have made an agreement that they would decide the fate of the world through a duel between their respective children. Desmond is the son of Althea and his friend, the black knight Arstein (アルスティーン, Arusutīn) is the son of Deimos. Since Arstein does not want to kill his friend Desmond, he gets Desmond to kill him. Since Deimos does not stick to the agreement and attacks Althea, the group has to fight against him in the end.