In year 3999, as a consequence of animal testings and biological manipulation, an experimental drug became a lethal pathogen unleashing a brutal pandemic.
In less than three years, humans became extinct.
Animal kingdom remained unaffected by this virus as a result of their immunity due to evolutionary manipulation generated from scientific research over the last 300 years.
Animals evolved reaching a high level of intelligence than the human race, capable of managing technology and their genetic code.
Three big societies arose as a result: Urban, Outside and Aqua: the Survivewilds.