So... is Oda Nobuna no Yabou finished or not?
NO, it is not finished.
Why?
We found unfinished non-core content:
Oda Nobuna no Yabou: Azuchi Nikki (Side Story)
Oda Nobuna no Gakuen (Spin-Off)
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
A modern-day high school student, Yoshiharu, is unexpectedly transported to an alternate version of Japan's Sengoku period.
This version of history is quite different: many of the powerful warlords he knows are now beautiful women, including Oda Nobunaga, who is now Nobuna Oda.
After a twist of fate, Yoshiharu becomes Nobuna's retainer and must use his knowledge of history, gained from playing a video game, to help her conquer Japan.
He aims to correct the altered timeline and possibly find a way back to his own time, all while navigating the challenges of serving a female warlord and the unusual dynamics of this alternate world.