So... is Tejina-senpai finished or not?
NO, it is not finished.
Why?
We found unfinished non-core content:
Isekai Senpai: Tejina-senpai wa Kono Sekai demo Ponkotsu na You desu (Spin-Off)
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
A newly enrolled, apathetic high school student seeking an easy club stumbles upon the school's magic club.
He finds it's run by an adorable but clumsy upperclassman, plagued by stage fright and prone to mishaps during her performances.
Reluctantly drawn into the club, the freshman finds himself entangled in her chaotic magical endeavors, witnessing (and often participating in) her embarrassing and awkward antics.
The anime follows their interactions and the humor that arises from the senpai's consistently failing magic tricks and the kouhai's reactions.