- "Exorcism" is the art of sending yōkai that have somehow wandered to "this world" back to the "Underworld." Hanae Ashiya, who has asked the Master of Mononokean, Haruitsuki Abeno, to do an exorcism, ended up being an employee of the Mononokean to pay for the 100 million En exorcism fee. One day, when the two finished work and went back to the Mononokean, an SOS arrived sent by one of the three officials of the Underworld, Rippō. They soon visit the Underworld, but Ashiya gets involved in an incident...
The story of Ashiya and Abeno's yōkai exorcism and the story of the yōkai open again.