In the Shikumen on Yuyuan Road in Shanghai, the nine-tailed fox Qingli made a nine-hundred-year-old "wish transaction": using your most precious thing in exchange for your most desired wish.
Until she met Lu Zian, a talented composer who exchanged childhood memories for musical talent. When the souls of the two resonated, a shocking truth emerged: the so-called "ascension" is actually "recycling", and every transaction is delivering energy to a system that spans eras.
The nine-tailed fox is the emotional regulator, humans are the energy providers, and the entire ninth era is just a huge ecological farm.
When the watchers in the starry sky open their eyes, the two chosen souls must make a choice: continue to be the enforcers of the rules, or become the adjusters of the era.
