So... is Jimoto ga Japan finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 23, 2020
Manga finished: April 02, 2020
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 hardened transfer student named Tokio arrives in Tokyo, eager to prove his strength.
However, his plans are disrupted by a hyper-enthusiastic, red-haired boy named Japan, who's obsessed with all things Japan.
Japan pressures Tokio to reveal his home prefecture, unwittingly dragging Tokio into a world of bizarre martial arts that draw inspiration from each region of the country.
Tokio's tough-guy aspirations quickly take a backseat as he navigates Japan's eccentric world and its prefecture-based fighting style.
The anime focuses on Tokio's increasingly chaotic life as he gets swept up in Japan's fervent passion for his country and its unusual combat techniques.