So... is Chousoku Henkei Gyrozetter finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 24, 2013
Manga finished: March 04, 2014
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
In a near-future Japan where AI-powered cars are commonplace, young students are trained to drive them.
Kakeru Todoroki, an ordinary fifth-grader, discovers he's been chosen for something extraordinary.
He's given a special AI car that can transform into a powerful robot called a Gyrozetter.
Kakeru is tasked with using the Gyrozetter to protect humanity, embarking on a mission greater than he ever imagined.