So... is Sasameki Koto finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 31, 2009
Manga finished: September 27, 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
Sasameki Koto centers around Sumika Murasame, a high-achieving student secretly harboring romantic feelings for her classmate, Ushio Kazama.
Ushio, on the other hand, is openly interested in yuri (girl-love) relationships, but remains oblivious to Sumika's affections.
The anime explores the dynamic between these two girls as Sumika struggles to confess her love, while Ushio continues her search for a girlfriend, creating a delicate and potentially humorous situation.
The story will likely focus on themes of unrequited love, self-discovery, and the challenges of navigating complex feelings within a high school setting.