I think it has the same meaning as when they speak in martial arts about the center of ki or something like that. The core you could say of where they store power.
From my perspective, It’s a good adaptation, the pace would probably be lacking if they followed the novel or maybe the writer wanted to shift his focus and streamlined it ? Both are interesting :)
it doesn't get better any time soon. things kind of change/got a bit better by ch 40. were barely going to start the seme heart broken & realizing how much he fucked up. he's a big jerk in the beginning though
I can’t handle this slow burn! I need spoiler
I do know there's the beginning of spicy scenes in chapter 45!
I'll be old or ded by then