You are the demon prince of the demon empire. After being beaten by a band of human holy warriors, you travel back to the emperor's castle and decide to steal a sealed set of armor that is said to be made by the devil himself. it is forbidden to wear as there are stories of previous users of it falling to ruin soon after. But will you really let those holy warriors get away with what they did?

based on this comic: https://hitomi.la/manga/ohime-sama-magaiden-english-104963-671164.html#1