So... is Pluto finished or not?
YES, it is finished.
Why?
The anime finished after the manga:
Anime finished: October 26, 2023
Manga finished: April 01, 2009
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.
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Synopsis
In a futuristic world where humans and advanced robots coexist, a series of mysterious murders targeting celebrated robots throws society into turmoil.
Gesicht, a robot detective, is tasked with investigating the seemingly impossible crime: the slaying of a war hero robot.
As the investigation progresses, it becomes clear that other powerful robots are being systematically targeted, suggesting a much larger and more sinister plot.
Gesicht teams up with Atom, a highly advanced and human-like robot, to uncover the identity of the killer and prevent further deaths, all while grappling with questions about the nature of robots, humanity, and the potential for violence in a supposedly peaceful society.