Hm, a zombie apocalypse, okay I know this always starts at school but it could be started somewhere else. Dont have to be students as MCs all the time, it could be doctors, firefighters, police, etc.
Idea 1: U can maybe have civilians at a safe homebase away from the zombies to find a cure or something else to plan an escape to get off the island…hm.
Idea: 2 …u can maybe start off as the MC is injured and stuck at a cottage or building and someone helps him/her quietly to escape the mansion or whatever building from the zombies, hm…