So... is Romantica Clock finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: February 25, 2014
Manga finished: April 02, 2016
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
Romantica Clock follows the story of twin siblings, Akane and Aoi.
Akane is portrayed as a beautiful, popular, and energetic girl.
In contrast, Aoi is described as clever but with an appearance resembling a small animal.
The anime explores the dynamic and relationship between these two very different twins, likely focusing on their daily lives and how their contrasting personalities interact.
The special episodes, aired as part of the Ribon x Oha Suta specials, offer a glimpse into their world and the unique bond they share as siblings.