I just finished reading this weeks chapters. I haven’t participated in a book club before so I’m excited to read along with all of you! I also want to start participating in this forum more, and book clubs seem a good place to start. And by chance I already own a physical copy of the first three books which I haven’t read yet. So really the stars aligned when I saw this in the “recent community topics” section and I had to join in 
I don’t really have a lot to say about the book so far. It was pretty difficult for me to read in terms of vocab, but I definitely understood the majority of what was going on at least. I also used an ebook version alongside the physical book so I could quickly look up words without disrupting my reading too much. The grammar was relatively straightforward I thought, though I would say grammar is my strong point over vocabulary or kanji so maybe that’s to be expected.
As for the story, I’ve seen the anime before so it wasn’t too new to me, but I did really enjoy the anime so I’m excited to enjoy it again with new details. The following spoiler tagged content is only about the part we’ve read so far, but of course the fact that I’ve seen the anime means I might not speculate in certain directions, so this might be a bit (very indirectly) spoilery? I don’t think it’s too bad though.
I was under the impression Main died from her fever.
そんな風に思っているうちに、幼い声は段々小さくなっていく。
The fact that the voice fades out like that feels like death to me, growing distant and fading into nothing. And right after that we get:
子供の声が聞こえなくなったかな、と思った瞬間、わたしを包んでいた膜のようなものが弾けて消えて、意識がゆっくりと浮上していくのを感じた
Like Main’s conciousness left to make space for Urano.
Also I found the audio book on Audible here, and it’s even narrated by Main’s anime voice actor 井口裕香, which is very cool. I plan to re-read the chapters we’ve read each week while listening to the audio book, and perhaps even listen to the audiobook on its own for more listening practise.
)