My favourite part this week was the part where Natsuki is in bed with nonhuman life pressing in on the other side of the window. Very evocative. I’ve never really been to places where the animal and insect noises are quite so overwhelming, but I can imagine it gets intense in summer on a wild mountain in Japan.
逆鱗に触れる
To touch the scales under a dragon’s chin = to infuriate? nice 
Just the fact that there is a two-kanji word for ‘the upside-down scales underneath a dragon’s chin’ is already enough to make this the vocab of the week.
Yes, between this book and かがみ Japanese middle school is presented as quite a hellish place to be (I even wrote that in my notes before I saw your question). I have a feeling, though, that Kokoro went through something even more sinister than Kise (as far as we know at this point). I do feel for Kise: you can’t escape the body that you are in, so it’s horrible to have your physical appearance be made fun of.
As others have commented, Kise’s problems seem to cause the parents to focus mostly on her instead of Natsuki, but so far, I wouldn’t call it excessive yet. Also, in my experience second children often have to live with less attention from their parents so Natsuki’s situation doesn’t seem exceptional (yet).
It was very striking that the promise to survive was added by Yuu…
This week wasn’t hard language-wise. Just one sentence I want to make sure I understand correctly:
野生の自分の細胞が疼いているような感じがした
This is in the part where Natsuki is in bed and I think this is saying something along the lines that it [sensing the nonhuman life of the night] is making her wild cells ache, which is a sentence I like, but I’m not sure I’m reading it correctly 
Yes, that crossed my mind as well. Let’s hope that we’re wrong.
I also interpreted it as ‘to feel out of place’, like you said.
Indeed. @dappe17, please add spoiler tags to your remark about the trigger warning!
And I would actually suggest that we do not discuss the contents of the trigger warnings at all, with or without spoiler tags, because I always assume that the information hidden behind a spoiler tag is only a spoiler for the current week, but the trigger warnings might contain spoilers for later weeks!

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