NO, it is not finished.
The anime finished before the manga:
Anime finished: April 01, 2006
Manga finished: February 26, 2008
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
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Ayumi, a witch facing the loss of her magical abilities due to a curse, seeks out Haruo as the key to breaking it.
Haruo, seemingly unaware of the magical world, lives a protected life thanks to his powerful witch sisters.
The anime centers on Ayumi's efforts to awaken Haruo's hidden potential and break her curse, while his sisters actively try to prevent her from doing so.
It's a battle of wills as Ayumi attempts to access Haruo's power against the resistance of his protective siblings.