The last couple of pages of Ch.18 are really striking, all the grief Aoyama has experienced... It made me tear up twice, once when I was originally reading and now again reading the lovely translation (thanks for the translation!). Aoyama's reflection and apology was really wonderful to see.
Regarding Yurika, I find her last name very curious. I was looking into the etymology of yuri(由理) and saw that the earliest place it was recorded was the Kojiki, one the oldest classical texts of Japan. Apparently 由理 was originally pronounced "sai". In the Kojiki, it states that the river got it's name "Sa(w)i" from the mountain lilies on the river's bank. So Yurika's last name Saikawa (犀川) sounds really similar to this other river mentioned in the Kojiki, Saigawa(佐韋河). A hell of a coincidence.
There are questions I still have about Yurika, like the reason she became a classical literature teacher. Was it because of her parents (given the classical origins of her name) or did her own connection to the classical texts become its own interest? What really was her reason for participating in Class S in the first place?
I imagine we will be seeing more of her if Kasumi and Haruyo talk to her about the letter, though I hope they won't have to spend much time with her. Someone please get Yurika away from schools...
The extras were super adorable and freaky, hoping for more~