7th Time Loop: The Villainess Enjoys a Carefree Life Married to Her Worst Enemy! (Manga) Vol. 4 (manga)

After her confrontation with Prince Theodore in the slums, Rishe was finally able to end the feud between him and his brother Arnold. Most people would take a break after an ordeal like that, but Rishe is not most people! So when they return to the castle and Arnold offers her any gift she'd like, it's not jewelry or trinkets she asks for, but a duel! Later on, another ghost from Rishe's past arrives in Galkhein. This time it's the prince of a neighbouring country who claims he's there to congratulate Rishe and Arnold on their engagement.

However, Rishe can't shake the feeling there's more to his visit than meets the eye...