Ling Chen, a top "dream recaller" living in the "Shenyuan District" at the bottom, was forced to accept the commission of the mysterious woman "Nightingale" to steal confidential documents from the minds of senior officials of the Order Bureau in order to save his sister Ling Shuang, who suffered from a rare "soul failure syndrome".
During the theft process, Ling Chen accidentally discovered that the energy "spirit" that maintained the operation of the entire floating city "Arcadia" was essentially the souls of countless imprisoned living people. The discovery made him the city's most wanted man. With the help of Nightingale and the resistance organization "Breaking Dawn" to which she belongs, Ling Chen struggled to survive. However, the city's supreme ruler, Mr. K, took Ling Shuang as a hostage and forced Ling Chen to submit. In order to save his sister and all imprisoned souls, Ling Chen decided to cooperate with "Breaking Dawn" and planned to sneak into the heavily guarded "Ectoplasmic Mastermind" at the city's "Eternal Celebration" to make the truth public.
On the day of the celebration, Lingchen and Nightingale, with the help of Neiying, broke through many difficulties and sneaked into the core of the mastermind. Ling Chen launched the ultimate showdown with Mr. K in the "Sea of Consciousness" in the spiritual world, and used his understanding of memory to awaken all the imprisoned consciousnesses in the master brain. He successfully seized the city's broadcast authority and told the world the cruel lie that the Eternal Council was based on the soul.
The old order collapsed, the imprisoned souls were liberated, and Ling Chen's sister was cured of her strange illness. Arcadia is plunged into a chaotic but hopeful new life. However, Ling Chen finally learned that Mr. K, who created all of this, had sent a message to the depths of the universe before his death, suggesting that Arcadia's tragedy was not the source, and that they might just be the "experimental site" of a higher civilization, leaving suspense for the story.
