So... is Time Travel Shoujo: Mari Waka to 8-nin no Kagakusha-tachi 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
Time Travel Shoujo follows Mari Waka as she embarks on a series of adventures through time.
Her journeys are inspired by the stories found in a book detailing the history of scientific discoveries, particularly those related to magnetism and electricity.
Essentially, Mari travels back to meet the scientists and witness the pivotal moments behind these inventions and discoveries firsthand.
The anime explores the fascinating stories of these historical figures and the circumstances that led to their groundbreaking work.