Exorcism is the art of sending youkai who have somehow wandered into the living world back into the underworld, where they belong.
One day Ashiya Hanae, a high school student who has been haunted by a youkai, happens to find the contact information of an exorcist called the Mononokean and pays him a visit. The exorcist he meets is a morose-looking young man, Abeno Haruitsuki…