(Anime Crossover) The Possibility of Romance with a Split Personality

body{background:url(http://i.6.cn/□□/ca/c4/a4/0ecac39e77b6a005e596375850ffc5b4.jpg)} Legend says that when twins are born, a demon comes with them and possesses one of the two. Only the one who becomes the demon can survive. Is that really the only way? They are twins, but there is no distinction between sisters. They have been together since birth, hand in hand, inseparable. One is blue. One is red. One is black. One is white. "The demon's eyes are red. Look at her eyes, aren't they red too? You'd better stay away from her. It's for your own good. Otherwise, one day you'll die without even knowing how!" "No way! Whoever White is, Black will always stay with her!" Whenever the little girl said that, the others would shake their heads and leave. White is White, not some demon. That's what Black believed, and always had. "Black, is White really a demon? Why does everyone hate me so much?" Little White sat beside the hospital bed, her voice choked with sobs as she looked at Black lying there. "Of course not. White is the most perfect girl in the world. No demon could ever be as good as White!" Black smiled faintly. "Really?" "Really!" Because they are twins, they trust each other unconditionally, stay by each other's side unconditionally, accept each other unconditionally, and understand each other unconditionally. White and Black, opposites. Let's live together, okay? That's our promise! [This story is a crossover between Deadman Wonderland and Katekyo Hitman Reborn!, with Katekyo Hitman Reborn! as the main focus. White is the female lead from Deadman Wonderland. I brought her into the story for personal reasons, though I don't know if anyone has read it. Black is an original female lead. This story is mainly about Black. This story came about on a whim, so updates will be irregular.]