Quite a nice ova all in all. Though there was a pretty profound change half way like JMSpeed said. The change in itself, even if I said so myself, is debatable. While Enma (and Yukihime) were kind of main characters, there were long parts of them not being on the screen so in that sense the change wasn't anything surprising, but I guess suddenly switching from the real world to some spiritual world took some getting used to. Moreover because it wasn't immediately evident what was going on. Although soon enough it was made clear enough.

The last touch with the last woman was a nice detail, and served the ruthlessness of the show finely. With it you can pretty much say all those people were actually dead already (that and the fact the police had been there for half a year already without eating and drinking) and the demon was just corrupting their souls into a form it could use as its fuel. The last woman who wasn't consumed was left there as a ghost. No wonder they referred to a lady in red earlier on when she was still collecting the rumours... A nice tie with the past. Details like that are what make decent stories good.

One particular scene I especially liked was when Enma tricked the demon by faking despair. I was totally expecting it and so it when happened, it looked even better.