The system did not come to our world. She was always in it, better known as Anima. Some people are born with her gift and are able to use it to fight monsters from faults. Faults, because of which humanity cannot control most of the earth. Therefore, people live in fortified city-states. The rest of the land is considered wild and inhabited by stray creatures. The main character only recently underwent initiation and got the opportunity to use Anima. He returns from a pilgrimage through the wild lands back to Moscow to kill three of the city's most powerful and powerful men. He did not want this fate, life just happened. But this does not mean that that trinity does not deserve its fate.