Two twin sisters are just living out their lives together. Demenia Chay, the quiet one of the two, and Lucida Chay, the irrational one always getting into trouble. Being seventeen is hard enough as it is, but now with demons, spirits, and angels after you? Doesn't sound very enjoyable. Two sisters Two souls One body Lucida the demon soul and Demenia the human soul. Let's see how this turns out.