So... is Nazo no Kanojo X finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: July 01, 2012
Manga finished: September 25, 2014
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
Nazo no Kanojo X centers around Akira Tsubaki, an ordinary boy, and Mikoto Urabe, a new and enigmatic transfer student.
Their unusual connection begins when Tsubaki unexpectedly develops feelings for Urabe after a peculiar incident.
The story explores their developing relationship, which is built on a strange and somewhat mysterious bond, highlighting Urabe's unique personality and the unusual ways she expresses herself.
The narrative focuses on the unfolding romance between the two, while hinting at a deeper mystery surrounding Urabe's true nature.