In nature, cats are born to be the natural enemies of mice. However, a ferocious-looking, 12-kilogram mouse nicknamed "Ni Cang", living in Yin Xian Hill in Dongguan, scared a cat so badly that it trembled all over and fled at once. In view of the mouse's such bravery, its owner decided to set up a fighting platform for the mouse to challenge the cat heroes all over the world. If anyone could defeat this so-called "Number One Mouse in the World", he would give the mouse to the cat as lunch.