Koi to Uso

is a manga written and illustrated by Musawo Tsumugi. It is being published by Kodansha with releases online by DeNA's Manga Box app in multiple languages. An anime and live-action film adaptation have been announced. The series is published by Kodansha in Japan and by Kodansha USA in the United States

Plot
In the near future, children who have turned 16 years old are assigned by the government to a partner based on compatibility calculation, in order to increase the country's birth rate. Those who do not follow the government rules of going with their assigned partner suffer severe penalties. Yukari Nejima finally confesses his love to schoolmate and long-time crush Misaki Takazaki and discovers she has liked him back. However, when he turns 16, he is assigned another girl, Ririna Sanada. Ririna is not that thrilled about being assigned, and is very willing to let Yukari freely relate with Misaki so she can learn what being in love is really like. The story follows their adventures of the teens as they try to relate with one another while keeping up appearances with the government.

Official

 * Koi to Uso Official Website

Other Sources

 * Wikipedia
 * MyAnimeList