In the near future, the world no longer has room for privacy, ignorance or anonymity.Everyone's private memories are recorded and stored, and crimes are almost extinct.However, under this seemingly perfect order, detective Sar Freelander discovered a surprising loophole while investigating a series of unsolved murders - a young woman seemed to have successfully bypassed the entire system and completely disappeared from all records. She has no identity, no past, as if she has never existed.Sal calls her a "girl".As the investigation deepened, he gradually realized that this was not just a few isolated cases, but the beginning of some new form of crime. In the process of uncovering the truth, Sal not only challenged this ubiquitous monitoring system, but also shook his understanding of justice and sin.He must find her before he becomes the next victim—but when he really approaches the “girl”, he finds that the truth of this hunt is far more dangerous and shocking than he thinks.