The outbreak of the Retro-Collapse Virus has torn the entire world apart. When the viral load concentration (VLC) of an organism reaches a critical point, it will transform into a huge monster.
In the second year after the RCV outbreak, humans built a technological fortress called "Iron Dome City" in the center of "Ember City", relying on technological weapons and external skeletons to continue to improve combat effectiveness and survivability.
The south of the city was reduced to a hell of ruins. Amid despair, a new possibility quietly emerged: in the third year of the RCV outbreak, the first "adapters" appeared in the southern ruins, the first human to "survive" despite reaching 100% VLC.
In the fourth year of the RCV outbreak, an explosion occurred at the Polaris Lab, a scientific research base in the north of Ember City that had been developing antidotes to the virus. The parasitic symbiotic crystal (Symbiotic Crystal) was born from the complex energy, but it also brought a cruel price of being swallowed by another energy.
Intention: bond, friendship, protection, redemption, stance, survival