Kurokochi is the most surprising dorama so far with the fact that it doesn't suck. This has a lot to do with the fact that the script does a good job of hiding the weaknesses of the two main actors. Firstly, the story is dark with a corrupt cop vs corrupt politician played by Watabe Atsuro but its part comedy as well so it excuses Nagase Tomoya's overacting as the cop Kurokochi. Its in contrast with Hanzawa Naoki which is completely serious yet has comedy-like overacting.
Secondly, Gouriki Ayame is there (so far) to strictly explain what is going on and Kurokochi's plans (and the comedy bit helps too) so I'm not hung up on htf she became a detective and stupid stuff like how the police won't charge into a house where the lone suspect is and instead send him a hostage.Gouriki Ayame's presence is to facilitate the story and she's not asked to do anything else.
The question is how long as the story keep the cat and mouse game between cop and politician interesting? I seem to recall watching a movie or dorama about the long unsolved stolen money case but I can't remember what it was. Watchable.