Lu Xun, the owner of a pet shop, discovers that his little store has unexpectedly become connected to the Hundred Thousand Demon Realms. A wounded and desperate Saintess of the Cat Clan, A Nuo, accidentally wanders inside. She mistakes the pet medicinal bath for a hundred-refined spiritual bath, cat food for immortal delicacies, and even cheap catnip is revered as the supreme divine herb of the demon realm. After being rescued, A Nuo strictly follows the Cat Clan's ironclad rules and declares Lu Xun to be her husband. Meanwhile, in the human world, his grandmother is critically ill, and unscrupulous creditors come knocking to collect debts. Across the realms, war engulfs the demon world, and the Cat Clan faces the catastrophe of total annihilation. Armed with nothing but ordinary pet supplies from his shop, Lu Xun spends ten billion to acquire kittens and assemble an army of one million cats. Using cutting-edge pet technology from the mortal world, he takes on demon cultivators at the Core Formation stage, travels between the two worlds, protects his loved ones, and defends the demon clans!