So... is Netoge no Yome wa Onnanoko ja Nai to Omotta? finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 23, 2016
Manga finished: December 08, 2023
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
Hideki, known online as Rusian, suffers a traumatic experience when his online proposal is rejected and he discovers the "girl" was actually a man.
Vowing to never trust female players again, he continues playing his favorite MMORPG.
He later joins a guild and reluctantly accepts a marriage proposal from Ako, a girl in-game, despite his initial skepticism.
The story follows Rusian's life as he discovers that Ako and the other guild members are not only girls, but also students from his own school, leading to potentially complicated and humorous situations.