On a rainy night, an abandoned black kitten on the street was brought home by a young girl named Luo Xiaobai, and she named the kitten Luo Xiaohei. Luo Xiaohei is not an ordinary cat, it is human-like, knows how to use the toilet, refuses to eat cat food, and its long tail can even split into minions named "black shoo". Meanwhile, the mysterious character named "Shimeji", sent out three winged wolves to search for Luo Xiaohei. Soon, Luo Xiaobai took Xiaohei to the countryside to visit her cousin Gen and grandfather, which led to various strange and mysterious events.