Thunder

Plot
During the Seryuu City demon incidents, he made the hypothesis: 'Wasn't the demon who possessed the man called Uusu different from the demon who attacked the castle?' and they fought each other because one intruded another's territory.

This hypothesis was considered by the earl because he is the leading magician in this territory and even in the kingdom he's among the five most powerful one. Even if what he said seemed absurd, it couldn't be ignored.