The school had been destroyed by the infection that goes by "The paper plague". The paper plague is exceedingly dangerous. If you get bitten or scratched, you'll be infected, and the cure is unknown.

Mister demi: battling many at a time all though he's a scardy type

Miss Sasha: gathering survivors C'MON, THIS WAY!!!

Mister demi: I NEED BACKUP!

Miss circle: GOTCHA!!!

Miss thavel, Bloomie, grace, and Emily are also gathering survivors