Yui was always an Angel to others especially to her father figure no not her real dad the man who lives with his brothers. He was always there for her when they went to school together. He is seen as a villain for how rude and mean he is but it's just to protect himself. When the Sakamaki's meet this man Yui's real self slowly shows that she's no Angel but she's a devil who will kill just to keep her dad..to bad others have the same idea as her.