In 2170 AD, a large-scale epidemic "dark matter" broke out on the earth. After the infection, people lost their minds and turned into monsters to attack humans. Just when mankind was in desperate situation, scientists suddenly discovered that young girls with immature minds could independently absorb and control the energy brought by dark matter. A legendary army was born. At this moment, the genius girl met him who was on the verge of death on the edge of the battlefield...