So... is Akaneiro ni Somaru Saka finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 19, 2008
Manga finished: April 25, 2009
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Akaneiro ni Somaru Saka centers around Junichi, a seemingly ordinary high school student, who unwittingly becomes entangled with Yuuhi, a privileged girl who ends up being harassed on her way home from school. He intervenes, earning the moniker "Geno Killer" in the process.
The following day, Yuuhi transfers into Junichi's class, complicating things immensely. Through a series of misunderstandings, including an accidental kiss, their relationship becomes the subject of gossip.
To further complicate matters, it's revealed that they are betrothed! Yuuhi, who holds a low opinion of Junichi, is determined to prove him unworthy of her. She moves into his house with him and his sister, setting the stage for a clash of personalities and a test of their unexpected arrangement.
The anime explores whether Yuuhi will succeed in her mission to expose Junichi's flaws, or if she will develop feelings for him during their forced cohabitation. It's a story of challenging expectations, dealing with family obligations, and the potential for love to blossom in the most unexpected of circumstances.