I'll Never Be Your Crown Princess! (Manga) Vol. 3

"Liddy and Freed have finally completed their engagement ceremony and are officially betrothed. But soon, Freed is called off to battle, leaving his beloved fiancée behind. He hasn't been gone long when Liddy stumbles upon an injured man in desperate need of help. But this isn't any ordinary man - he's a desert assassin suffering from a curse! Will Liddy be able to save his life? Or rather, should she?"--