Kemono no Matsuei

"This is my revenge..." The world is now in a violent era. In this world, there are twelve beings born with "Celestial Beasts" that dwell within their souls. Lyla is a young girl who has been living in a small village. She and the people of her village know that she is one of the twelve beings, a "Celestial", but her celestial beast has not yet awakened. To help awaken the celestial beast, she begins training with another of the twelve, a boy named Soju. As Lyla turns 15, an evil consort from the Shuka Kingdom reaches out to the village, with the intent of using Lyla's powers for their own nefarious purpose... From this, Lyla's destiny takes a turn for the worst in ways no one could have expected. (Source: Manga Plaza)