The school trip was the first real event Zyon ever faced, the moment that could truly be called the point where the game actually began. Later on, that trip came to be known as "The Last Night", a name that was by no means given without reason, for it was indeed the final night for many people. It was also remembered as one of the worst nights in the entire history of the Empire of Athena.
On that night, a massive battle erupted between the Atran Organization and the Empire of Athena. The Atran Organization carried out horrifying rituals that surpassed all limits of madness, sacrificing half of the population of the city of Harten in an attempt to summon the Tenth Pillar, one of the most powerful demons in the world.
Within the demonic hierarchy, the Demon King sits at the very top as the strongest entity of all, followed by the Ten Pillars, who are the most dangerous and powerful demons directly beneath him.
