"Hunting Nightmare in Mountains and Seas" is set in the Daqi Dynasty, connecting the human world with the "Great Wilderness" in ancient legends. The ancient evil spirit corroded the alien beasts and turned them into "nightmare beasts". The nightmare hunters organized the "Xuanpu Alliance" to counter with the "Mountain and Sea Technique" (four images to control water, control the wind, etc.).
Cang Xuan, a half-blood of the Qingqiu Fox Tribe, lost his mother due to the massacre of the village by the nightmare beast Qiongqi, and his younger sister Lingxi was dyed half-nightmare by the violence. He brought his sister into the Xuanpu League and met Chisongzi (Thunder and Fire Technique) and Aman (Flying Wind Technique). The trio went through the wild and dangerous journey and awakened their superpowers. Behind the scenes, the ancient god Zhu Yin wants to gather the four elephant treasures to break the seal of Youdu and restore chaos.
From the blood oath in Qingqiu to the decisive battle in Youdu, the story interweaves the growth of partners and the choices of heaven. In the legend of ancient beasts, it writes an epic of protection and redemption.