So... is Yuri Seijin Naoko-san finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 18, 2010
Manga finished: February 27, 2014
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.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Synopsis
Naoko-san, an alien with a unique goal, has arrived on Earth. Her mission? To turn the entire planet into a "yurified" version of itself.
Living atop the roof of Misuzu's house, Naoko-san's presence constantly disrupts the junior high student's life.
When rumors of a local menace surface, Naoko-san and Misuzu find themselves drawn into an investigation, embarking on an adventure together.