So... is High School Mystery: Gakuen Nanafushigi finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
High School Mystery: Gakuen Nanafushigi follows Mizuki Ichijo, a high school student with a unique connection to the supernatural due to her grandmother's past.
At Kosen High, she encounters a plethora of strange and unsettling events, ranging from tragic accidents and bullying to more romantically charged, yet still mysterious, situations.
With the help of Meiko Tsukikage, a kind upperclassman, Mizuki embarks on a journey to unravel the truth behind these eerie occurrences.
Together, they investigate the mysteries plaguing their school, navigating a world where the line between the ordinary and the paranormal is constantly blurred.