Isabella Osa is the queen of the Demon Tribe and the titular deuteragonist of My Wife is a Demon Queen. After being betrayed by her High Commander Lilian, Isabella fulfills an ancient prophecy by summoning an ordinary human named Xiang Ye to aid her in reclaiming her throne. Having lost her demonic powers, Isabella hid amongst the humans while learning swordsmanship and magic at the Royal Academy as Xiang Ye’s wife, Yi Bei. After overthrowing Lilian, Isabella regains her powers and marries Xiang