The story takes place during the Warring States Period, when there are all kinds of demons, monsters, and other creatures in the world, collectively known as "darkness". The dark fox Xiaoyu, who likes humans, and the immortal Xunhuo, who hates humans, are brothers and sisters who are carrying out a world-saving activity to eliminate evil. In addition, there is a group of monks who specialize in dealing with darkness, the Duanguaizhong, who perform human body transformation in an inhumane way, and Xunhuo and others have a fierce conflict with them! There are also bad people among humans, and non-human beings are not necessarily evil. Xunhuo hates humans very much because of what happened in the past, but during his journey, he gradually witnesses the good side of humans. Can he change...