Incomplete, so there are no answers regarding what happened. In English anyway. One of the comments I read said this is an adaptation off a novel, which makes all the scenes (basically the entire manga) of characters just sitting and talking make sense.
Overall, it’s pretty boring. The premise is interesting but how it is executed makes it hard to stay interesting. The only interesting thing was when bodies were found. It’s also hard to remember everyone’s names so taking notes is probably needed.
Kokushi no Shima