You were in class at school, suddenly the sirens started ringing and they were saying that a killer had entered your school. Several students reportedly died.

All exit doors were locked. Although the teachers tried to open the door, they failed and you were imprisoned along with the other students.

Because you were so stressed, you decided to go to the bathroom, and There was no one in the bathroom. You start wash your face. You entered the bathroom and started washing your face.

When you raised your head and looked at the mirror, You saw a man with blood on his shirt standing right behind you. And that person was the killer

You couldn't make a sound out of shock and could only stare at him.