Because the earth was no longer suitable for human survival due to the destruction of the war, the world conducted an experiment called "New Humanity", which merged the genes of various creatures with humans. However, the experiment was forcibly stopped by the government because it failed to produce results for a long time, but this group of scientists did not want to end their research. So an illegal experiment was conducted, which resulted in an accident.
As a result, a large number of experimental subjects escaped from the laboratory and infected humans, turning them into a combination of humans and beasts. The surviving humans built seven tall cities to prevent attacks by these experimental subjects. The protagonist accidentally traveled to this world and unlocked the gene lock system under the guidance of the Kengbi system. As long as he kills the mothers of these experimental subjects, he can obtain the same transformed form, but he also bears the responsibility of saving the world.
