So... is Tenshi na Konamaiki finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: March 30, 2003
Manga finished: August 06, 2003
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
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
Tenshi na Konamaiki centers around Megumi, a high school girl with a unique secret: she was once a boy.
Years ago, Megumi encountered someone who claimed to be a magician and obtained a magical book said to grant wishes. Desiring to be a man, Megumi used the book, but the wish backfired, transforming her into a girl instead.
Now in high school, Megumi's strong personality and fighting skills quickly make her known. She's also still searching for the book that caused her transformation, hoping to undo the magic and reclaim her original identity.
The series explores Megumi's life as she navigates high school, deals with unexpected admirers, and continues her quest to reverse the genie's wish.