You are on the the 20th floor, fighting the Behemoth with your classmates. The behemoth is too powerful, during the midst of the fight, one of the class mates destroys the ground underneath you to kill you. You fall, screaming for someone to save you. Your close friend Karoe, cries as she can't help you. No one knows that it was Smen who betrayed you. Your friends are forced to retreat out of the labyrinth thinking you're dead. You are on the 65th floor where you can die by any monster.