So... is Mahou Shoujo Site finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 23, 2018
Manga finished: August 01, 2019
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
Mahou Shoujo Site tells the story of Aya, a young girl enduring severe bullying and abuse who finds a mysterious website offering her magical powers.
Initially skeptical, Aya soon discovers the power is real and uses it to protect herself, leading to unintended and tragic consequences.
She then encounters another magical girl, Tsuyuno, and together they navigate the dangerous world of magical girls, uncovering secrets and facing threats far beyond their understanding.
Their journey leads them to confront a looming apocalyptic event called "The Tempest," forcing them to fight for their survival and uncover the truth behind the magical website and its purpose.