Premieres January 2025. The new PV is here. Check out the ANN article for additional information. Synopsis from AniList:

My wish as champion is for you to descend the tower and be my wife."

Seeking to end a curse thwarting his lineage, Prince Oscar sets out on a quest that leads him to a powerful and beautiful witch, Tinasha, and he demands a unique bargain: marriage. Though unenthused by the proposal, she agrees to stay in his castle for a year while researching the spell cast upon him. But beneath her beauty lies a lifetime of dark secrets that soon come to light.