So... is Jibaku-kun finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 28, 2000
Manga finished: October 30, 2000
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
Jibaku-kun follows Bucky, an ambitious boy from the first world who dreams of world domination.
His ordinary life takes a dramatic turn when he encounters Spark, a powerful being known as the Great Child of Primas.
For reasons unknown, Spark unexpectedly chooses Bucky as his successor.
This sudden appointment transforms Bucky into a Great Child himself, tasked with earning the allegiance of Jibaki, the spirit of their world.
The anime will likely focus on Bucky’s journey to understand his new role, connect with Jibaki, and navigate the challenges that come with such immense responsibility, potentially hinting at how this transformation changes his original goal.