So... is Imawa no Kuni no Alice finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: February 16, 2015
Manga finished: January 20, 2021
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Imawa no Kuni no Alice follows Ryouhei Arisu, a directionless young man who yearns for something more than his mundane existence.
One fateful night, after witnessing a strange and dazzling firework, he and his two friends are inexplicably transported to a bizarre and dangerous parallel world known as the Borderland.
In this new reality, survival hinges on participating in perilous games, each designed to test their physical and mental limits.
Arisu and his friends must navigate this deadly landscape, unravel the mysteries of the Borderland, and ultimately fight for their lives to find a way back home, all while Arisu unexpectedly discovers a sense of purpose he never knew he craved.