Romantica Clock
Type: Special, Episodes: 3
Aired: Feb 4, 2014 to Feb 25, 2014
Source: Manga
Rating: G - All Ages
Synopsis:
Three episodes aired on TV as part of the Ribon x Oha Suta specials. 

Akane: She's beautiful and popular, lively and full of vitality; Aoi: Looks like a small animal but is actually very clever. Who knew that these two very different people were actually... twin siblings?! 

(Source: MU) 

Note: Episodes were made available on the official stream few days before the official broadcast.