This documentary completely, and somewhat disgracefully, overlooks the utter incompetence and laziness of the Japanese police. There is no mention of how utterly useless and slow the police were for large parts of the investigation. There are also a couple of very significant points about the investigation that are overlooked or misrepresented to paint the police in a much more favourable light. Quite a disgusting documentary on something so utterly horrific.
It does not take long at all to find out the information that this documentary so drastically misses the mark on.
It seems strange how what appears to be the entirety of the Japanese police force interviewed in the film, but then again if you realised you could have the chance to gloss over catastrophic errors in your job history I'm sure you would do the same.