In the floating city "Floating City", memory is the most expensive currency. People can buy happiness or they can sell their souls.
Ling Su, a memory detective with a ruined future, barely survives at the bottom of the city where neon lights and rain are intertwined. He makes a living by exploring the broken memories of others, but deliberately keeps his own past dusty.
A seemingly simple commission drew him into the center of the whirlpool - to find a memory crystal about the "First Rain" belonging to the deceased. The mysterious woman in the upper-class area, the desperadoes in the black market, and the ghost killer who follows him everywhere all start a life-and-death struggle around this small chip.
When memories can be tampered with and identities can be reshaped, where is the boundary between truth and falsehood? In order to reach the truth, Ling Su must dive into the deep sea of consciousness composed of data and face the nightmare that he least wants to look back on. He discovered that what he was pursuing was not only a lost memory, but also a shocking conspiracy that could subvert the entire civilization.
But this time, he had nowhere to escape.
