Have you ever experienced true despair?
In a post-apocalyptic wasteland where light is swallowed by demonic energy and shrouded in eternal darkness, the survivor base "Sunset" is like the last lonely boat, struggling on the edge of destruction.
A seriously injured girl with no memory, Su, wakes up deep in a dangerous, polluted area. Her body is covered with strange demonic scars, and an out-of-control mechanical arm is her only connection to the past. When she was on the verge of being swallowed by the monster, a blazing white beam of annihilation fell from the sky, bringing destruction and saving Su.
The one who saved her was a mysterious demon warrior with a bandage on his right eye and as cold as ice——, the destruction just now was just one of his shots. He took Su back to the legendary refuge "Sunset".
Here, Su discovered that his body concealed sophisticated technology that transcended the times, and met a lively AI consciousness that lived in a robotic arm and called himself "X". She tried to piece together the truth about her amnesia, but found herself involved in a bigger mystery...
Now, Su's awakening seemed to have touched a silent switch. What does the "FS-7 Plan" engraved on the blood-stained chip that fell from her broken robotic arm mean? Why does the demonic energy in her wound seem to be alive? And what kind of frozen secrets are hidden in the savior's past?
