In the beginning of
Shinsekai Yori I didn't suspect bakenezumi's thread would be used as
a important theme. In the end I'm happy it did, because it lead to
interesting aspects. I will try to analyze some of bakenezumi's life
through these years, it will be more of summary and if you watched
the anime more carefully than me, you can amend me if I made a
mistake.
Spoilers till episode 21
of Shinsekai Yori