So... is ACCA: 13-ku Kansatsu-ka finished or not?
YES, it is finished.
Why?
The anime finished after the manga:
Anime finished: February 14, 2020
Manga finished: October 25, 2016
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
ACCA: 13-ku Kansatsu-ka
ACCA: 13-Territory Inspection Dept.
Anime - Base
Release date: January 10, 2017
ACCA: 13-ku Kansatsu-ka - Regards
ACCA: 13-Territory Inspection Department - Regards
Anime - Sequel
Release date: February 14, 2020
Synopsis
In the kingdom of Dowa, the ACCA organization maintains peace and order across its thirteen states. Established after a period of unrest, ACCA now faces whispers of a potential coup.
Jean Otus, a key figure in ACCA's inspection department, is tasked with auditing the branches in each of the thirteen states.
As Jean travels and investigates, he will encounter a wide array of people and cultures. The intricate web of relationships between them holds the key to uncovering the truth behind the rumors, and his journey promises to reveal a complex and politically charged situation.