In the distant future, human civilization has spread throughout the galaxy, relying on a quantum system called the "Echo Network" to maintain the operation of interstellar society. The core of the network is a technology that can read, store and even predict the consciousness of living beings - the echo mirror.
Ella is an ordinary tuner in the Echo Network, responsible for clearing out the noise of consciousness in the network. One day, while dealing with the remnants of an abnormal consciousness, she accidentally discovered a "pure memory" that could not have existed - an echo of consciousness that did not belong to any known life form. This discovery draws her into an interstellar conspiracy and forces her to question everything she knows about reality.
As the investigation deepens, Ella realizes that this mysterious echo is not only related to the origin of the echo network, but may also hide the forgotten truth of human civilization. What she doesn't know is that her every move is being monitored by all parties. Every time she gets closer to the truth, she is pushed to the edge of danger.
