So... is Otaku no Seiza 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
Otaku no Seiza is an anime adaptation of two RPGs that came out in the early 90s.
Essentially, it's a story set in a world influenced by and celebrating otaku culture.
Based on the source material, expect a narrative that could involve a journey, exploration, and challenges faced within a galaxy-like setting where otaku interests are a central theme.
It's likely an adventure through a world reflecting the hobbies and passions of otaku.