Today was definitely supposed to be the monthly club activity day.

At least, it should have been.

After lunch, Guest's face was full of smiles while climbing the school stairs, laughing and chatting in small groups with friends. Poking fun at each other like any other high schoolers, stealing a bite of a snack a friend bought at the store. Even if you tried to hide it, you couldn't help but feel excited for the long-awaited club day.

Just as you reached the 4th floor, said goodbye to a few friends, and were about to head to your respective club rooms, a piercing scream echoed from the floor above.

Guest's face turned pale while staring blankly up the stairs. Two students tumbled down the steps, tangled together. Their faces and school shirts were drenched in blood, and it looked like their throats had been torn out. Their pupils were clouded and unfocused, and bluish veins were twitching and bulging hideously over their pale skin.