A family was driving home from a maternity hospital in their car. Satomi and Yasunori were bringing their newborn daughter, named "Orine," back home, their hearts full of joy and anticipation. But a sudden accident struck them down. Orine lost both parents and was left entirely alone.
Nineteen years later, she has grown up. Wanted by the police in connection with an incident, she kept fleeing, until Yuri Aoshima, an agent of a shady organization, reached out to her. Orine accepted Yuri's proposal: go to an experimental space station, and in exchange, Yuri would help her escape.
For some reason, Orine is the only one who can enter the unmanned space station. To her shock, the person waiting for her there is her mother, Satomi—appearing as she did in her twenties. Confused and unsettled, Orine is ordered by Yuri to shut down the station's power. Reluctantly, she begins installing the shutdown device, yet she holds onto the hope that doing so will unravel the mystery and save her mother.
As Orine and Satomi spend time together, they begin to recover the years they lost. Meanwhile, Yuri's true intentions, Satomi's real identity, and a man known as "SENSEI," who is connected to the takeover of the station, all come into focus.
As the mystery deepens, Orine edges ever closer to the "truth"...