The Most Heretical Last Boss Queen: From Villainess to Savior - Tome 3

Princess Pride has made it to age sixteen without succumbing to villainy, turning her potential enemies (or victims) into allies all the while. On the night of her birthday party, she meets the charming, handsome prince of another kingdom — and he's also her fiancé! Pride knows that a future of despair awaits him, so she takes it upon herself to protect the prince and guide him toward a happy ending.