So... is Kokkoku finished or not?
YES, it is finished.
Why?
The anime finished after the manga:
Anime finished: March 26, 2018
Manga finished: September 22, 2014
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
Juri Yukawa is a young woman struggling to find her place, living with her complicated family. When her nephew and brother are kidnapped and held for ransom, the family faces a desperate situation.
Juri's grandfather reveals a hidden power: a stone that allows them to enter "Stasis," a world where time is frozen.
Juri, her father, and grandfather enter Stasis to rescue the hostages, but they quickly discover they are not alone. Others can also move within this frozen world, and they are hostile.
Amidst the chaos, a mysterious and powerful being known as the Herald appears, adding another layer of uncertainty and danger to their rescue mission in Stasis.