Humans are clever in tens of thousands of ways, but Gu represents the true refined essences of Heaven and Earth. The Three Temples are unrighteous, and the demon is reborn. The past is but a distant dream, and a familiar name is reborn anew. A story of a time traveler who keeps being reborn in a world that grows, cultivates, and uses Gu. The Spring and Autumn Cicada, the Venomous Moonlight Gu, the Wine Insect, All-Encompassing Golden Light Insect, Slender Black Hair Gu, Gu of Hope… And a great demon of the world who does exactly as his heart pleases! — Gu (蛊) refers to poison in South Chinese culture, where folklore says Gu spirits can transform into many species.