The December issue of Shueisha's shōjo magazine Ribon will publish the final chapter of Yoko Maki's Romantica Clock manga on November 2. The issue will also reveal that the ninth volume of the manga will ship on November 25.

Additionally, the issue will also announce a spinoff series featuring the cast of the manga in high school. Ribon will release more details in 2016.

Romantica Clock is a comedy about twins: the beautiful, popular, and energetic Akane, and her smart, aloof brother Aoi. Akane, who has felt jealous of Aoi since she was a young child, continues to be unable to get along with him even as the two grow older.

Maki launched the manga in Ribon in 2013. Shueisha published the eighth book volume in June 2015. Additionally, a three-episode television anime adaptation aired in February 2014 during TV Tokyo's Oha Star program.