The 23rd chapter of Shimeji Simulation first appeared in Monthly Comic Cune April 2021 Issue on sale on February 26, 2021.
To be written.
Yomikawa holds a book by Roland Barthes named La chambre claire (Wikipedia). Looks like it's important for the story.
Shirirori (しりとり) is a Japanese word game in which the players are required to say a word which begins with the final kana of the previous word. No distinction is made between hiragana, katakana or kanji. "Shiritori" literally means "taking the end" or "taking the rear". (Wikipedia)