Yes, true, the ORIGINAL ''Fugo Keiji'' novel that had drama adaptation in 2005 was written by the problematic creator, Y/asutaka T/sutsui.

However, this ANIME ADAPTION was just ''based'' on that plot and the script and the series composition is now handled by Kishimoto Taku. https://twitter.com/rapdogmon/status/1248383192475635717

The original one by tsutsui had its girl main lead named Miwako Kanbe, granddaughter of a millionaire who became a detective and started working at a police station where there are few women.

Difference to the anime adaptation?

For anime adaptation, Kishimoto Taku made it about male leads which are Daisuke and Haru.

Why Tsutsui need to have a copyright for this?
It's because Taku followed the plot and story that the main lead is a ''millionaire'' The studio can be sued if they didn't.

The second reason why they needed to copyright him is because they used the exact same title which ''Fugou Keiji''. They can be sued again if they used that title without copyrighting him.

The novel by tsutsui is entirely different from what kishimoto did for the anime.

To make it short, this anime adaptation is not written by the one problematic but is just ''based on'' and ''inspired by'' what the mf wrote.

//base on
To found something on a particular idea.

and also, if you think I am just barking here without knowledge, know that I did my research just to prove my point.

Thank you.