Yep, mystery+supernatural+detective is epic win. My favourite character is Junichirou, he may be Ryoko's slave but he can kick asses, somehow he is the enhanced version of Rock
I was a little puzzled seeing how they lead the investigation. They entered the villain's nest without any backup!? O_o
But it's nothing major, still, as I previously said, I am disappointed with the songs.
I hope Ryoko and Junichirou's relationship will develop, but 13 episodes...