So... is Oda Cinnamon Nobunaga finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 28, 2020
Manga finished: August 25, 2021
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Imagine historical figures, specifically powerful samurai generals from Japan's Warring States period, being reborn in the 21st century. But there's a twist! They're not reborn as humans, but as adorable dogs.
The story centers around Oda Nobunaga, a prominent figure in Japanese history, who meets his end and finds himself reincarnated as a Shiba Inu named Cinnamon (Shinamon). He grapples with the absurdity of his new existence.
As the series progresses, other famous warlords from his era also reappear as dogs, leading to comedic situations as these once mighty leaders navigate modern life as pampered pets. Expect to see them retain some of their old personalities and rivalries, but now expressed through canine antics.