Yeah, I was surprised by the sudden jump to supernatural, as short as it was. Although to be fair most of the show was about Niwa trying to rationalize everything, so it was a very limited point of view, and thus never stated to be the true one.

A nice last episode in any case. Maekawa would have been my choice as well, if for nothing else, then for simple peace of mind. Although adolescence points aren't probably counted from peace of mind...