Story opening by Blai- Horror building

The building was empty. The boy walked but there was anyone. He screamed more times but anyone answered. He looked his class, and he open the door. He was go to take his backpack and his dark pen. The blinds were very closed. The lights were open. He taked the backpack and the pen and he was started to running because he was scared. When he arrived to the door of the building, it was closed. He looked to the left and he saw a dark person in a chair, looking to the wall...