Well, after Earth has been destroyed, a new Earth was created. This earth is only inhabited by cats. They try their best to keep this Earth alive. It's like Attack on Titan, but with invading enemy armies, not titans. Iggy Pawsrup is the main protagonist. He serves as the king's messenger as well as his youngest knight. Though he is shy, he can still put up a fight. After a while, he quits the royal army and decides to become the youngest adventurerer in town. He also runs into some interesting characters that join him on his adventures.