In the future city "New Arc City" where neon lights and acid rain intersect, memory has become a commodity that can be edited, deleted, and even traded. Zero, a "memory scavenger" with a ruined future, who makes a living by clearing other people's painful memories, has long been numb. A seemingly ordinary commission involved him in a fatal whirlpool. The target is a mysterious girl named Xi, who has a "root memory" hidden in her mind that can subvert the order of the entire city. Under the pursuit of the giant enterprise "Eternal Life Technology", Zero was forced to flee with Xi. As the fragments of the truth continue to be picked up, Zero discovers that the countless memories he has erased, as well as his own dusty past, are closely connected with Xi. He must find his own island of memory in the ocean of forgetfulness.
