So... is Grenadier: Hohoemi no Senshi finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: January 13, 2005
Manga finished: March 26, 2005
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
Grenadier: Hohoemi no Senshi follows the journey of Rushuna, a skilled gunfighter with an unusual mission: to bring peace to a war-torn world.
Rather than resorting to violence, Rushuna aims to disarm her opponents with her radiant smile, hoping to quell their fighting spirit.
Despite her pacifistic intentions, she's often compelled to use her impressive marksmanship to defend herself and others.
Along the way, she encounters Yajirou, a swords-for-hire mercenary, who becomes her companion, and together they travel the land, confronting conflict and spreading Rushuna's unique brand of peace.