First two episodes were really exciting. I love how the manga is used to provide clues to murder. The one thing I didn't like that prevents me from rating it a must watch is Kaname telling an unconscious woman his sob story in episode 3.
There was no need to spell it out and small flashbacks should have been enough for the audience to piece things together. Plus, his overacting is a bit too much. Its like the director saying, "OK, now sneer and look as evil as possible."
Fourth episode is decent and there are a lot of questions left unanswered. I love the pairing of Matsushita Nao and Furuta Arata. Their chemistry is great and I enjoyed Furuta Arata's portrayal of the slightly eccentric and grumpy editor.
So far so good. The preview for the final episode looks very exciting. I can't wait. Not must watch but worth watching.