In 2021, the world is going wrong.
Something is wrong ×1:
All the teenagers aged 11-18 in the world, those who have not gone to school, those who travel, those who are on leave from school, those who are hospitalized, those who are bound with splints, and those who use wheelchairs as mounts...
There are no exceptions, and no matter whether it is scientific or not, all the above-mentioned and unmentioned human beings of the appropriate age, those with school status, returned to school wherever they were originally; those without school status had already applied for school registration suitable for their age many months in advance, and finally on September 1st, they all came to their new school or a long-lost school.
On September 1, 2021, no one can forget the "grand occasion" at the gates of various middle schools.
Something is wrong ×2:
The non-student humans over 18 years old who were in school seemed to be restrained by some force majeure on September 1st and did not go to school.
Note, "non-student".
The staff, the cafeteria aunt, the sweeper, the security guard, all the adults who can be seen everywhere in the school on a daily basis, were missing that day.
Something is wrong ×3:
On September 1, no one else noticed anything was wrong.
When September 1st passed and the first second of September 2nd began, they discovered that all campuses had turned into ghosts.
It can be reached by the eyes, but cannot be reached by people.
The "rescue team" sent out by the almost crazy parents is like fishing for the moon in the water or flowers in the mirror.
Even worse than that. After all, water and mirrors are also real objects. The campus at this time is more like a 3D projection, which can be seen but cannot be touched.
The students didn't notice anything and continued to go to school "happily".
But soon, things are going to change.
Intention: To live towards death