The post-solar era will appear in a certain year in the future. Sunlight mutates. The seven colors that make up the sun can bring different abilities to people. For example, red light can make people emit flames, and green can make people strong. At the same time, a dark force quietly devoured the land. In the devoured land, animals and plants mutated, which was called the Dark Forest.
In the post-solar era, four major tribes were gradually formed, namely the Gods, the Undead, the Demons, and the Spirits. After research by scientists, the world that has not been eroded by the dark force is a circle. The dark force is devouring the land with a certain place as the center, so all tribes are migrating toward the center of the world from different directions.
The Gods are the strongest among the four major tribes. Through negotiations with the other three, they finally occupied the center of the world alone in the post-solar era. And it has built the world's top light energy university - Shendu Yuliangmu, where outstanding students from all over the world gather to start a new chapter in their lives.
In the post-solar era, there is a mineral that can store light energy, called light storage stone. The Sukey is a light-storing stone that contains great energy. There are seven pieces in total: red, orange, yellow, green, cyan, blue, and purple. It is said that if you master all the trace keys, you can go through the dark forest and trace the origin of the world. This is also the meaning of the name trace keys - the key to trace the origin of the world.
The protagonist Qingmen started his college life at Yuliangmu. He established a club and named it Zhulang, which means chasing the wave of the times. He and his friends lived in Yuliangmu and learned about light energy. At the same time, they investigated the truth of the green key trace incident, caught the real culprit, and protected each other.
