Decades ago, the continent was enveloped by a catastrophe called Void, and humans had to unite to form an ally against those void monsters – Blessers. The border before Void has become the last line of defense against Blessers. Until one day, a missioned young girl named Shan Hu breaks out of Void, and another young girl called Yu Jia also comes to the border on a mission. The forces hidden in the dark, the thoughts in people's hearts, and the historical truth hidden in Void gradually come to light.