Well, it would seem that it was a trait that he got from his father who was also in the Demon Patrols.
Same thing happened with Henri when Amelie was born. Narnia's father wanted to experiment on both Merize and Amelie.
Wouldn't surprise me that he taught Narnia of such things about humans and...
I genuinely would love to see Shiida's back story. Why she joined Baal as a member of the Six Fingers and why she wants to protect Iruma, human and all.
My only theory is that she once had a younger brother, and he used to be like Iruma.
I genuinely need to know, does things turn around or is this just gonna be pure NTR all the way, cause...why? Is this supposed to be a reflection of reality? The nice guys get rejected and all?
Yeah, this manga's story hadn't gone further than the main manga's story. If anything it's behind. Hopefully all 24 chapters/or more, will be uploaded soon