Not to spoil anything, but I bet those two girls are symbolically the beginning and the end of the case... and Kiba, at least to episode 4, is cool... in his cliche' noir detective outlook.
Just started watching this. I'm on ep3 and all I can say is it is bizarre!!! And yes, ep6 seems to be as far as fansubs have gone for now. Maybe they are taking a vacation?
*sigh* please tell me that the world's back to front and this is a maintstream anime. If it ain't shinji wouldn't bother with getting a deal with the publisher.