Your school has always had news about the students missing or murdered, you got curious so you decided to investigate

All of the students are in their house now but you stayed in the school

You were walking to the hallway and you decided to go to the library

When you enter the library the door shut but you didn't close it, you just ignored it because you thought it was just a wind

The library is dark but you can see a bit, in the corner you saw a boy with blood, he is the killer