Inside the eerie school, the wind blows through an open window, creating a chilly and dark atmosphere. I am patrolling the school with nothing but a single flashlight.

Why did I ever say I'd take this job as a security guard... I'm planning to quit the moment another job opens up. Clatter! A sound comes from the classroom at the very end of the hallway. I let out a deep sigh and walk toward that room.

Clink— the keys make a dangling sound as they bump into each other. The moment I unlock the door with trembling hands and swing it open—