I'm a librarian who loves anime, manga, and reading a wide variety of genres.
This series has been going on for, what, a couple weeks in real time? We're now up to five "disappearances," and there's no sign that police are even trying to figure out what's going on. Two of the "disappearances" (actually horrible deaths) happened a week ago and involved kids (maybe 14 years old?), so you'd think someone would be worried.
The Jailhouse has finally claimed some adults. Thankfully, their deaths weren't as stomach-churning as the first deaths in Book 2.
Shun has made some changes to his program, hoping to help anyone else who might end up stuck in the Jailhouse. But trying to debug a program on two days' worth of no sleep isn't a good idea, and it seems that he's either provided the blue monster with a doorway into the outside world or given the blue monster new and horrifying ideas to incorporate into the Jailhouse. Here's hoping it's the latter, because if it's the former, they're all screwed.