So... is Joker Game finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 21, 2016
Manga finished: January 05, 2018
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
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.
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Synopsis
As World War II looms, Japan forms a top-secret spy agency called "D Agency."
Eight highly trained agents are dispatched to various powerful nations across the globe.
Their mission is to gather crucial intelligence on political and economic situations that could influence the war.
These agents are experts in manipulation, languages, and survival, allowing them to infiltrate and observe without detection.
Their ultimate goal is to provide Japan with a strategic advantage by obtaining valuable information.