I'm a librarian who loves anime, manga, and reading a wide variety of genres.
Story #4 was wacko.
There's been very little overlap so far between the different stories. I've been trying to keep track of details that have been mentioned in more than one story, on the assumption that those details are likely to be true and might be clues as to what really happened, but the list doesn't seem to be very useful so far.
Only two of the six Literature Club members haven't been accused of murder yet, and there are two more stories (plus closing remarks) to go. I'm interested to see how Akiyoshi wraps this up (hey, poisoned stew is still a possibility!), and I'm glad that this has turned out to be a quick read.