So... is Dimension W finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 27, 2016
Manga finished: June 25, 2019
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
In a futuristic world where a fourth dimension, Dimension W, provides seemingly endless energy through devices called "coils," a former soldier named Kyouma Mabuchi, who distrusts this technology, works as a "Collector," retrieving illegal coils.
His life takes an unexpected turn when he encounters Mira Yurizaki, an android with ties to the creator of coils.
As strange incidents begin to unfold, Kyouma and Mira form an unlikely partnership to investigate the secrets surrounding Dimension W and the illegal coils.