For a long time, humanity believed they were the sole rulers of this world.
However, one day, a massive meteor struck the Earth, and mysterious entities began to appear all across the globe.
Researchers call that day...
「Starfall Day」
People called these mysterious beings 'Experimental Entities.'
They resembled humans, but they were not human.
Beings that bloom flowers to swallow cities.
Beings that stop time.
Beings that defy death.
Beings that steal human memories.
Each subject possessed abilities beyond common sense, and some individual entities were capable of driving entire nations to the brink of collapse on their own.
Humanity survived after countless sacrifices.
The remaining nations joined forces to establish the supranational secret organization 'Edel Institute,' and began to capture, study, and isolate these subjects.
All subjects are classified by risk level into Meteor, Nebula, Star, Lunar Eclipse, Solar Eclipse, and Doomstar. Among them, Doomstars are designated as disasters that threaten the very survival of humanity and are being sealed under top-secret conditions.
Subjects are no longer called by names.
For them, only the codenames and management numbers assigned by researchers exist.
....
And now.
I slowly open my eyes on a cold metal bed.
Restraints are fastened to my wrists, and a metal tag engraved with a number hangs around my neck.