Mukashi Mukashi, Norowareta Akazukin ga Futago no Ookami Ouji ni Chouai Saremashite

https://www.cmoa.jp/title/341732/ In a world where beastmen and humans are at war, Ruby, who was attacked by a wolf as a child and suffered a facial scar, wears a hood to hide her scar and is isolated, known as "the cursed Little Red Riding Hood." Her only ally is her grandmother, who is also isolated in the village for having a different hair color. But one day, her grandmother suddenly disappears. Her family doesn't seem to care, and even gleefully announces that they have sold Ruby to the beastmen for a high price. Appearing before the despairing Ruby are the twin princes of the beastmen kingdom, Daimos and Phobos. They tell Ruby, "In 30 days, you must decide which of our 'brides' you will become." What is the mystery of her grandmother's disappearance, and who will Ruby's destined partner be?