Was He the Demon King Before Reincarnation?

A friend was killed, and he chose to join a special academy for revenge. The students here were not ordinary people, but angels and demons, and he was actually the devil? Not only is he responsible for the future of the college, he also has a wife who has yet to regain her memory! Are all my descendants in this academy? "I've met the Demon King!" Elaire: "I'm just an ordinary college student! I don't know what's going on with the ten halos and wings behind me! I'm going home after avenging my friend. Don't call me the devil!" "I heard that the beautiful girl in the academy is the Demon King's wife!" Yi Lair: "That's right, I didn't expect you to discover this, my wife's identity!" "But you just said..." Elaire: "What's yours, please call me Demon King." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.