So... is Null Peta 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
Null Peta tells the story of Null, a young and brilliant inventor dealing with the loss of her beloved older sister, Peta.
To cope with her grief, Null embarks on an ambitious project: creating a robot replica of Peta, hoping to recapture the connection they once shared.
However, the "Peta Robo" she builds turns out to be quite different from the sister she remembers, leading to unexpected and potentially humorous situations as Null navigates the challenges of living with a robotic version of her sibling.
The anime explores themes of grief, artificial intelligence, and the complexities of family relationships, all while likely maintaining a lighthearted and comedic tone.