|Manga Debut||Chapter 1|
|Anime Debut||Episode 1|
It is unknown when and where they come into existence. It is said that Impurities have existed since the beginning of time. Furthermore, it is said that they are born from the depths of people's sins and karma.
While they vary greatly in overall appearance and size, Impurities have dark skin and a kuji-kiri on their torsos.
Once an impurity absorbs enough spell power, it evolves into a Basara. A human like impurity that can speak human language. Their power and strength is a much more powerful than most impurities and exorcists. They also gain an ability to use enchanted gears like exorcists do. Only a few of them exists in Magano.
Exorcists and humans that are corrupted by a spell are called fallen impurities. These impurities are much stronger than normal impurities.Their appearance are much like the normal impurities but their kuji-kiri marks are green. Some of the victims were the Hinatsuki Dormitory students, Mayura that was later purified by Benio and Rokuro and Ryougo's friend.