lucy heartfilia is really rin and Yukio's sister. She has known for her whole life that she was the daughter of Satan. Lucy even is more powerful then what fairytail thinks. One day, Rin and Yukio comes to fairytail to see lucy. (her real name is Ember Okumura.) What's happen's when she goes to true cross academy?
#124 in Satan out of 519 stories
#190 in Blue Exorcist out of 755 stories