Not gonna lie, this is annoying me. Let me remind you that it was Baal that arranged the attack on the banquet and it was Iruma that saved her but Baal stole the credit. As well as she is so easy to manipulate here. If this wasn't a school life genre then this antagonist would be B tier at most. I cannot wait for the ending of this story.
I hope they do a timeskip so Iruma gets back soon and this Demon gets what he deserve, preferably die and not imprisoned.