So... is 11eyes finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 23, 2009
Manga finished: September 25, 2010
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
11eyes follows Kakeru and his friend Yuka as they are inexplicably drawn into a strange, dangerous world during a phenomenon known as the "Red Night."
Initially believing it to be a dream, they soon realize the threat is real and recurring.
They encounter four other individuals who share their plight, each possessing unique abilities.
Together, they must band together to survive the "Red Night" and uncover the secrets behind this terrifying world and the mysterious shadows that haunt them.
The anime explores themes of survival, camaraderie, and the search for truth in the face of the unknown.