Right? It gave me that feeling too.
Like it wasn't thought out.
I hardly read the mangakas' end notes, but there are proper answers to those questions.
It seems this was an experimental work and those non humans were originally vampires. However, this was meant for short publication and they kept details short. This is what left in my mind
I thought they were incubi.
╮(￣▽￣)╭
Oh
That was my thought too XD it's not a rare plot and makes sense
I feel like this story was a bit messy .. like hes another species or whatever but what ? A demon like what ?
Also why did they randomly introduce he forgot his memories
Shouldve done it earlier ?? And they just randonly introduce the seme and ugh it was so confusing like idk idk it feels a bit random and the timing is a bit wierd
Like idk if its just me and it also feels like made a chapter but the plot and story line wasnt finished so they had to come up with it while they were drawing and publishing it :p