The kingdom of Barbatos is threatened by the army of the Demon King in the south. Therefore, Aegeus, who was born with exemplary fighting potential, was taken in by the royal family when he was young in order to train him to become the saviour of the kingdom. Now, 10 years have passed, and Aegeus is ready to set out on his journey to defeat the Demon King once and for all...... But what can a Hero do when the stubborn Princess insists on going with him?