It's pretty good. It reminds me of Hell Girl in the way it's a bit episodic and formulaic. Now, that could change later as small, SMALL hints of more are given, but really, moreso in Vol 1. I like it, it's addicting and plays to the dark side a bit of malicious justice some of us (may) wish upon perps we feel skirt justice.
I'm hoping the manga-ka (sp?) starts delving a bit more into what makes our MC tic and provides more insight to his backstory soon...or at least begins to flesh out the side characters in the precinct around Detective Dan.
Overall, a nice dark escape.