Engaged to the Unidentified focuses on Kobeni Yonomori, who on her 16th birthday meets Hakuya Mitsumine, her fiance, and his sister Mashiro. An anime television series adaptation by Dogakobo began airing in Japan on January 8, 2014.
Kobeni Yonomori is a high school girl who lives with her mother and older sister Benio. Upon turning sixteen, Kobeni is shocked to learn that, due to an arrangement by her late grandfather, she is engaged to a boy named Hakuya Mitsumine who, along with his little sister Mashiro, come to live with Kobeni. As Kobeni spends time adjusting to this new family, she learns there is more to Hakuya and Mashiro than meets the eye.
