So... is Katte ni Kaizou finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: October 26, 2011
Manga finished: July 21, 2004
... But 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
Katte ni Kaizou follows Katsu Kaizou, a highly impressionable high schooler convinced that the world is teeming with supernatural and extraterrestrial phenomena.
He joins the school's science club and gets caught up in a series of increasingly absurd and self-contained adventures.
Each episode plunges Kaizou and his friends into bizarre situations involving everything from strange creatures to outlandish conspiracies.
The anime focuses on the humorous and over-the-top reactions of Kaizou as he navigates these strange and unusual circumstances.
Ultimately, it's a comedic exploration of Kaizou's gullibility and the outlandish events that constantly befall him.