Logically speaking since this is a one-shot obviously it still has many potentials for now I will state the limitations:
MC is a Girl who was blind for a long time (Personality wise she thinks the world is beautiful place once she could see)
Setting:
The World is Corrupted, basically nasty or something and there was this weird blackhole,
Ending:
It ended with a blackhole sucking everything, basically either the girl presented is not the MC but some kind of past history based on the words of a history teachers (whilst going back to the present) showing the real MC, probably male.
Another ending is that its simply there, I don't know maybe she survived.
Basically the limitations are : girl character, distraught personality, corrupted world, distrust towards words (due to lying mother)