So... is Yoake Mae yori Ruriiro na: Crescent Love finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 21, 2006
Manga finished: August 26, 2011
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
Yoake Mae yori Ruriiro na: Crescent Love tells the story of Tatsuya, who lives in a special location that connects Earth and the Moon Kingdom.
His life is disrupted when Princess Feena Fam Earthlight of the Sphere Kingdom (the Moon Kingdom) comes to stay at his home.
The anime likely explores the relationship between Tatsuya and Princess Feena, as well as the complexities arising from the connection between Earth and the Moon.