Sennen no Hanayome Manga

Chitose, the youngest daughter of the Usagitsuki family, known for their fertility, is blessed with beauty and spiritual powers, and there is no end to marriage talk about her. However, she falls into a trap set by her older sister Kuon, and is cursed to turn into an old woman. Although Chitose loves children, she has given up on her dream of becoming a mother, and spends her days bravely enduring Kuon's harassment. One day, when Chitose turns 18, a mysterious man named Kotaro appears before her and says, "I'll grant your wish." (Source: Kodansha, translated)