Ayashi no Ceres, Scrapped Princess Recommendations
They are a lot alike story wise. Where-as the both Aya and Pacifica are hunted by their families and their people. both have a twin brother who doesn't have the same fate as them, the sister. Both are very good stories, they each have their differences, but they are just as good. even though Ayashi no Ceres is a little bit darker, i recommend both.