In the "Eternal Night City" where memories can be stripped, stored and traded, the memory-weaver Ah He, who has lost his memory, makes a living by repairing the broken memories of others. A mysterious commission involved him in a huge conspiracy: a woman named Eva asked him to retrieve a core memory that had been deliberately erased from a taboo "abyss chip." When Ahe dived into the abyss of memory built of lies and pain, he was horrified to discover that that forgotten history was not only related to the fate of his clients, but also closely connected to his own blank past. On this isolated island built of memories, he must sail into the ocean of forgetfulness to find the drowned truth.