The official Twitter account for the Koi to Uso manga revealed that the series will resume its final arc on December 5th . It's worth noting that it will feature two distinct endings: a "wedding route with Misaki" and a "wedding route with Ririna."
Furthermore, the 12th volume of the manga will be the final volume, and it will be released on January 7th . There will be two different versions of the 12th volume, one for Ririna's ending and another for Misaki's ending.
The Koi to Uso manga went on hiatus after chapter 280, released on April 18th. MangaBox began publishing the manga from the first chapter with a new chapter every day starting April 26th.
Finally, it's worth noting that the 11th volume of the manga had already hinted that the series was nearing its end.
Source: ANN