Konyaku Haki Sareta Akuyaku Reijou wa Maou ni Kyuukon Sarete Imasu

https://www.cmoa.jp/title/332982/ After being falsely accused and cast out by the prince who breaks off their engagement, Aileen is banished to the dangerous Demon Forest with no hope of survival. Her fate takes an unexpected turn when she is brought before the Demon King, who surprises her with a marriage proposal instead of hostility. As she begins a new life among demons, Aileen gradually finds acceptance, love, and a place where she is truly valued. Together with the lonely Demon King, she overcomes prejudice and political conflict while building a heartfelt romance.