So... is KimiKiss Pure Rouge finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 23, 2008
Manga finished: November 14, 2008
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
KimiKiss Pure Rouge centers on Kouichi Sanada, whose life is shaken up by the return of his childhood friend, Mao Mizusawa, from France.
Mao moves in with Kouichi's family while her parents remain abroad, reuniting her with Kouichi and their other childhood friend, Kazuki Aihara.
The anime follows the trio as they navigate the complexities of high school life, particularly focusing on the ups and downs of romance. They offer each other support as they face their individual romantic challenges and try to find their way.
The story is about friendship and the search for love amidst the backdrop of high school.