A yokai named Egen is scheduled to visit the mundane world. Egen, who dreams of establishing a school in the Underworld, will be observing Abeno and Ashiya's high school for a limited time. Ashiya does his best to help Egen. However, Abeno's foul mood leaves Ashiya bewildered. There's something bothering Abeno about Egen's visit, but Ashiya is completely unaware of what that is.

Framed for robbery, Fuzzy is taken to "White Sand Prison," the residence of the Justice, another one of the Underworld's top three like the Legislator. Ashiya, who has come to the Underworld with Abeno to argue for Fuzzy's innocence, is shocked to discover the Justice's surprising true identity. Meanwhile, Abeno realizes another yokai is involved in the incident: the Executive, another one of the top three. The human-hating Executive is very displeased that a human is working for the Mononokean, a shop that has deep ties to the Underworld. And through the Executive's scheming, Ashiya and the Executive come face to face...