I also think so
Maybe he's really the principal's son, that's why his parents are so like that
That would be cool, then he could have something like locked powers which he eventually unlocks and he becomes super OP
so... did they make a deal to have him for gold?
that might make sense since he has such great agility when he's in danger... how else would he survive ... those parents?
But the symbol that Iruma got on his parchment with his blood for summoning familiar, showed that it was a human symbol? So I'm not really sure if he's really a demon, probably someone special but not pure demon? xD
http://www.mangago.zone/read-manga/mairimashita_iruma_kun/nbt/57652ea05792c9ba/Ch2/22/
i thin Iruma is not totaly human and the color of his hair is diferent of his parents
and Azu-kun a Clara makes a nice cuple