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--
A yokai who came from the Underworld 
to observe the mundane world.
Ein Yokai, der von der Unterwelt kam,
um die irdische Welt zu beobachten.
Vino del inframundo
a visitar una escuela.
Ça veut dire qu’il sera en classe
pendant un bon moment…
Uma yokai que veio do Submundo
para observar o mundo humano.