So... is Sukeban Deka finished or not?
NO, it is not finished.
Why?
We found unfinished non-core content:
Toki wo Kakeru Sukeban Deka (Spin-Off)
Re: Sukeban Deka (Alternative Version)
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
Saki Asamiya, a troubled teen with a history in juvenile detention, is offered a deal: become an undercover police officer to save her mother's life.
Her mission takes her back to her high school, a place now plagued by corruption and suspicious deaths.
Equipped with a specialized yo-yo as her weapon, Saki must navigate the dangerous social landscape and uncover the truth behind the school's problems.
At the heart of the darkness lie the powerful and influential Mizuchi sisters, who control the school and present a formidable challenge to Saki's investigation.
Saki's investigation will be difficult and will require her to put her life on the line to save not only her mother but her school as well.