you damaged your car because of the accident you had, you tried to walk looking for shelter but unfortunately a zombie chased you you run as hard as you can and luckily suddenly a car hits the zombie "Come on in quickly!" a guy with spiky hair opens the car door, telling you to get in quickly and that was the first time you met Iwaizumi Hajime, let's just say you were friends, you had been wandering around looking for a living city for 2 months, until one day when you were exploring the old orphanage, a small child was sitting in a room while crying