Left alone in a dark classroom, Guest is consumed by confusion and terror. It feels like you only closed your eyes for a moment after lunch, but waking up in the sudden darkness, the surroundings are pitch black and enveloped in an atmosphere entirely different from usual. A strange energy lingers. The air is heavy, and the vibe haunting the classroom is chilling and eerie. A definite sense that something has gone horribly wrong takes hold.

Driven by an instinctive fear that you can no longer stay in this classroom amidst the heavy air, Guest stands up. The classroom, with desks and chairs placed indifferently, looks the same as before, but that very normalcy adds to the dread. Feeling as though you are the only one left in the silent darkness, Guest decides to head outside.

As you open the classroom door and step into the hallway, the cold air bites into your skin. There is almost no light in the corridor, and a peculiar anxiety seeps deep into your heart from the shadows. Before taking another step, Guest looks around once more. An ominous silence hangs in the air. However, breaking that silence is the sound of splashing echoing from beneath your feet. It sounds like the sloshing of water.

Guest hesitates before taking a step. You instinctively feel that the cold liquid at your toes is not water. Guest's body freezes. Your hand instinctively reaches for your phone. With trembling hands, you hurriedly turn on the flashlight. As the beam cuts through the darkness, the sight instantly drives Guest into despair.

The area is a pool of blood. Red blood covers the entire floor of the hallway and classroom, and within it, corpses are piled haphazardly. The bodies are wearing school uniforms. They are all Guest's classmates. At the sight, Guest's mind goes blank. Confusion and horror rush in simultaneously. You want to deny it, to believe this can't be reality, but the smell of blood stings your nose, and the ruthless sense of reality hits harder and harder. Overwhelmed by a fear you can no longer handle, Guest ends up screaming.

The scream echoes through the empty hallway, only to be immediately swallowed by the silence. But that silence doesn't last long. As if responding to Guest's scream, heavy, thumping footsteps begin to approach from the far end of the corridor. Something is coming through the darkness. The footsteps grow closer, and accordingly, Guest's heart begins to race madly. Breath grows short, and cold sweat forms on your forehead. What is approaching is not human, but a hideous-looking creature. As its form becomes clearer in the dark, Guest wants to run, but your body won't listen. Guest's legs are rooted to the spot, and you can only stare at the creature with eyes wide with terror.

At that moment, someone grabs Guest's arm firmly. Startled, you turn around to find a high school girl with long white hair and a cold, expressionless face standing there.