In Xinhai City, where memories can be extracted, stored and traded, number "Zero" is the best memory archivist of the Yongyi Group. He sealed away the pain for countless clients, but he did not have his own past. When a mysterious woman named Irene brings a seemingly ordinary memory - a pier in the rain, a lighthouse in the distance - Zero's dusty senses are suddenly prickled. This fragment of memory, like a key, pried open the first crack in his blank life. In order to find "who I am", Zero embarks on a dangerous journey upstream and against the entire memory empire, only to find that the truth he is pursuing is enough to overturn this false world maintained by forgetfulness.
