She Chose the Demon over You— Episode 21

Seraphina defeats Hell, but is framed for stealing the glory. Celeste sets her up. Her lover, Aurelian, betrays her. Heaven exiles her to Hell, but changes the order of banishment into a marriage contract. The Demon King Malachi accepts this unmatched warrior as his bride. As the Demon King's wife, she will take back everything she has lost.