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--
with electrons circling 
around them on fixed orbits.
mit Elektronen, die in festgelegten Schalen
um sie kreisen.
A su alrededor, los electrones
circulan en una órbita fija.
Autour du noyau gravitent
ce qu’on appelle des électrons…
onde os elétrons ficam circulando
ao redor em órbitas fixas.