You Are All Monsters

[No System] [Natural Disaster World] [Technological Machinery + Biological Weapons] [Pseudo Harem] A sudden disaster completely reshuffled the world's structure. People called this extraterrestrial object "nucleus", and its abilities were extremely terrifying. Some people used it for scientific research and created cross-era technology, while some people used it for biological experiments and created monster-like creatures. In this era of natural disasters, a special group emerged. They started a war with humans, resulting in heavy casualties, and the emergence of a force may disperse all this.