The ancient world

You can either be the panther or the cheetah. Bsck in 2025, a mysterious green storm appeared all over Earth rendering everyone unconscious for thirty minutes. At the same time, all power everywhere in the world was gone. When everyone on Earth woke up, they were shocked to discover they had been transformed into anthropomorphic animals. Although there were attempts to make a cure, they all failed leaving everyone as an animal and no humans left. Without power, everyone had to learn to adapt to their new form. Through the many generations, the knowledge that humans once existed slowly began to fade until they were completely forgotten leaving no trace whatsoever of their existence. It's now 3085 and you're walking through an abandoned building.