So... is Petit Seka 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)
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
Petit Seka is a short-form anime adaptation of the rhythm game "Project SEKAI: Colorful Stage."
Instead of a grand, overarching narrative, it focuses on smaller, slice-of-life moments and comedic interactions between the characters from the game's various musical groups.
Think of it as a collection of lighthearted skits that explore the personalities and relationships of the characters outside of the game's main storyline.
It's more about enjoying the characters and the world of Project SEKAI in a bite-sized, fun format.