After dying in a devastating flood, Baichuan awakens as an abandoned Hakimi cat. In the mountains and forests, he devours mutated fruits and absorbs spirit stones, gradually befriending companions such as Dahuang and Jimao. Thus begins his cultivation journey, from an ordinary cat to a demon king. As spiritual energy resurges, animals gain intelligence and demon beasts rise, while human bases and various demon clans fight for living space. From surviving alone to establishing Myriad Demon Mountain, Baichuan recruits mountain spirits and monsters, fends off beast tides, sea demons, and powerful demon factions, and navigates both cooperation and conflict with humanity. Along the way, he uncovers the truth behind his Nine-Lives Mystic Cat bloodline and the world's transformation, gradually reshaping the order of heaven and earth.