7th Time Loop: The Villainess Enjoys a Carefree Life Married to Her Worst Enemy! (Manga) Series by Hinoki Kino, Touko Amekawa

Every time Rishe turns twenty, she dies and is reincarnated to the day she gets dumped. She has been a merchant, an apothecary, and even a maid. For her seventh life, she has one goal: to live a long and lazy life. But then she gets a marriage proposal from the Crown Prince -- the man who killed her in her previous life as a knight. Despite her determination to avoid drama, here she goes again!

Every time Rishe turns twenty, she dies and is reincarnated to the day her engagement is broken off. This time around, she winds up the fiancee of the man who killed her in her previous life: the crown prince of the Galkhein Empire, Arnold! Knowing from her past lives that Galkhein is on the path to war, Rishe is determined to prevent it. She starts by turning the royal villa into a training ground... for handmaidens! Will her unorthodox plans be enough to keep disaster at bay?