A mobile game called "Stone Leaders" has been turned into an animated show featuring two stories per episode. The setting is a post-apocalyptic future where machines are destroyed, forcing humans to revert to a more primitive lifestyle. Due to cloning fossil samples during the previous era, ancient creatures like dinosaurs, woolly mammoths and saber-tooth tigers are back to roam the earth in a more friendly form, and humans can become Stone Leaders by adopting these animals and engaging in battles against other players.