The outbreak prevention office has issued an infection alert in the area. The students are told to get out of the school before anyone sees them. They are also told to contact the authorities if they see anyone suspicious. The two students wonder if they saw someone in the school just then. They don't want to tell the girl they saw, but the authorities will check her identity. They also wonder if the alert had been issued by mistake. They wonder if there was an intruder from outside the wall. The virus kept multiplying and turned the survivors inside into monsters.