Fallen Angels, tainted by their own desires, have descended from heaven. Their goal is to corrupt humans by making them give in to their desires. By doing so, the Fallen Angel proceeds to become a Demon. 3 Angels, Lemit, Racquel, and Chiseri have been given the task to hunt down those Fallen Angels. After, being saved from one such Fallen Angel, Kazunari Shijou is pulled into the conflict. His existence has also caught the eye of both Angels and Fallen Angels alike due to a power inside of him. And if left unchecked, his power could corrupt him and lead him to being judged and killed by the Angels. Chiseri and the other Angels take it upon themselves to make sure Shijou's power stays under control in more ways than one. Chiseri has taken a particular liking towards Shijou though. Why is she drawn to him?