I Have a Little White Cat

What are the nine realms? The world of gods, immortals, Buddha, demons, demons, spirits, monsters, humans, and the underworld. Cats have nine lives and can travel through nine realms. A magical cat and an ordinary person, what kind of sparks will they create? What stories will they leave behind in the world? Where will they end up? Demon world? Demonic world? Or the world of gods!