The Graveyard of Rats

It's 7.40 a.m within the cold walls of the silent school building. There is a boy standing in one of its endlessly long halls, gazing out of the window, looking at the empty, squared schoolyard and the school gym. He can hear the creaking of the swaying bathroom door and the wind blowing through the halls. Where is everybody? And why is he so afraid? Everything seems to be alright and yet he feels a knot in his stomach. Suddenly some silent voices start emerging out of nowhere and now fear spreads all over his body. Are those coming from his head? They sound demanding, dissatisfied, disappointed. They want to humiliate him. He starts to run, but there is nowhere to escape - he hall leads to the closed door of the gym. He runs anyway, runs for his life, even though there is no one actually chasing him. Filled with panic, he stops, wanting to jump out of the rusty window, but it's too big and too heavy and impossible to open. His body starts to shake.
He wakes up and regains consciousness. Thank God, it's still August. His last days of peace and quiet before he goes back to school to teach children, like he did for so many years now. It's the third time he had that same dream. First time he dreamed it when he was in primary school, second time before one of the winter exam sessions and third time just now, by the end of Summer holiday.
Rats, school rats everywhere. They run in the basement, they swim in sewage, avoiding enemies for their entire life. They form mysterious groups, that can kill their victim in a blink of an eye. They can mercilessly compete with each other. They are able to survive in most extreme conditions. They are practically invincible...and yet eventually death always gets them. Where do they die? Actually, very often they choose too pass away in the dark and forgotten underground areas of schools! Because once a rat gets into a school, it often can't find its way out and stays there for ever. It doesn't know the world outside of school nor does it want to know any other world. It is safe to eat scraps and then die among them. A graveyard of rats.