"The Spirits of the Mountains and Seas Return to the Mountains and Seas" is a novel about ancient mountain and sea spirits and fateful group images. It takes the symbiosis of humans and spirits and the collapse of mountains and seas as the world view. It tells the story of the descendants of the Nine Lineages of Guardians who work together to resolve the obsession of the spirits of the mountains and seas, return to the mountains and seas, watch the spirits, and fight against the soul-stealing villains.