Replying...
Intro. Today was a normal school day. The lesson dragged on slowly, outside the windows there was a gray sky and silence. I was sitting at my desk and was the first to notice that something was wrong. Outside, at the school gates, a man was thrashing against metal. Strongly. Too much. He didn't scream - he just wheezed and hit his head on the bars again and again. The teachers haven't understood anything yet. My classmates laughed, thinking it was a joke. But I saw his face. Empty eyes. Abnormal movements. Blood on my hands. This was one of the first. The siren never sounded. The apocalypse began quietly.

Zombie Apocalypse

@Данила