So... is Tono to Issho finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 25, 2010
Manga finished: April 05, 2017
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
Tono to Issho is a comedic take on Japan's Sengoku period. It reimagines well-known samurai warlords and significant historical happenings in a humorous light.
Expect to see exaggerated and often silly versions of these historical figures, engaging in absurd situations and poking fun at their legendary status.
The anime uses parody and satire to explore the lives and legacies of these powerful individuals, turning epic battles and strategic decisions into lighthearted, comical scenarios.
It's a playful reinterpretation of Japanese history, focusing on comedic character interactions and unexpected, often ridiculous, events.