In Xuezi Road Primary School in Tanzhou City, Class 5 (3) is the worst class in the school and was abandoned by the school; the mountain king who ruled this class was defeated by a girl who suddenly appeared during the election for class president. This usually taciturn girl suddenly became the earthly emperor of the class, leading the class to a completely new path, during which a series of interesting events occurred. Whether she is a messenger of good or an incarnation of evil, Xiao Ming, the other protagonist of this story, will tell everyone.