Summarised.
About [redacted name]
Seat 0
A. There is a non existent highest dimensional dead person among you who appear as if alive(not deleted yet), he/she is the <imposter>.
B. Whenever the school recognise that there is a extra student. The students begin to die one by one in gruesome way until none remains.
So in order to compensate for <imposter> his/her existence, the previous council deleted records of another student name [redacted].
C. The [redacted] student is non existent yet existent. However to recognise her as someone/something would instantaneous start the unknown anomoulous phenomenon which will start killing 'final destination style'. Hence, everyone ignores her.
D. In case, someone recognise her, they have to kill the <imposter> at the spacetime where it all began before the phenomenon kills all.
E. Everyone in shf had died to phenomena countless times and each time it reset by point of view of [redacted]. She doesn't want any more deaths, hence she stays away from everyone. No one remembers.