The world regressing to the state of middle ages through demon invasion is an interesting concept, and the book has atmosphere, but the author seems to have forgotten to add plot to his narrative.

Maybe something starts in the twentieth book of the series, but I’m not patient enough to wait that long.

Positive:	Negative:
Interesting setting	The plot seems to be just a random string of barely related events
Characters are all right	No actual story seems to be set, in the first book at least