So... is Sunabouzu finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 30, 2005
Manga finished: October 12, 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
In a post-apocalyptic Japan transformed into a vast desert, known as the Great Kanto Desert, survival is a daily struggle. Amidst the harsh conditions, a masked mercenary called Desert Punk, or Sunabouzu, has made a name for himself as someone who always completes his assignments, regardless of the obstacles.
He navigates this dangerous landscape, known for his cunning and effectiveness, becoming a disruptive force in the already chaotic world. However, his reputation is challenged when the Vixen of the Desert, Junko Asagiri, discovers his weakness: an unyielding attraction to well-endowed women.
The story follows Sunabouzu and the Vixen as they get into misadventures across the Great Kanto Desert, along with a cast of strange and often violent characters who seem doomed to repeat the mistakes of the past in this destroyed world.