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--
And there are even instructors 
well-versed in their fields.
Und selbst die Lehrkräfte
sind sehr versiert auf ihrem Gebiet.
Hay profesores especializados
en cada materia.
Chaque professeur
est expert dans sa matière…
E eles têm instrutores tão
entendidos do assunto.