So... is Taboo Tattoo finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 20, 2016
Manga finished: June 27, 2017
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
Taboo Tattoo follows Seigi, a middle schooler with a strong sense of justice and martial arts skills. He receives a mysterious tattoo after helping a homeless man.
This tattoo turns out to be a powerful weapon, part of a secret conflict. Seigi is then targeted by a dangerous girl who also wields this power.
Now, Seigi must learn to control his newfound ability to survive. He is pulled into a world far more dangerous than anything he's ever faced.