閲覧厳禁 is so different from 硝子の塔の殺人, it’s hard to think it’s the same author who wrote both.
I enjoyed reading it, because I love horror in general, but I’m not sure I liked the editing direction all that much.
The story, the plot and the characters are all fine, it’s just not as shocking or scary as it claims to be. It’s entertaining for sure, and very easy to read, but that’s the point: it almost feels like the book was made to be easy to read. I would say that the story in itself is very short, maybe more the length of a novella, but it’s artificially expanded with page layouts that leave a lot of blank space here and there. Layout effects are also not always relevant, for example, some sentences were in bold or used special fonts, but it did not have much impact in my opinion? I also found that some visual inclusions (the book contains pictures and plans) did not brought much, and were there mostly to make the reading experience easy and pleasant (and make the book look appealing if you flip through it in the bookshop?). They felt more like additions than a necessary part of the plot, and most of the things showed could have been described instead.
Still, it was entertaining, reads very quickly and very easily, and I personally enjoyed it from start to finish, but the story was also not as terrifying or impactful as I expected it to be.