The young man's hand touched the World Wall, triggering a fierce surge of emotions and spirits within him. Suddenly, a massive explosion occurred at the edge of the wall, releasing an immense amount of mana across the world.
However, only the young man the first to conquer the World Wall received a uniquely powerful and intense form of mana known as "Black Mana." In that moment, he was consumed by the Black Mana, enveloping both his mind and body. As a result, he became the first demon in the world.
When he returned to the land of humans, the now mindless young man, driven by negative energy, destroyed the human kingdom, leaving nothing but ruins.
Two years later, three powerful humans united to confront the young man, who had transformed into a demon. Though they were unable to defeat him, they succeeded in sealing the Black Mana and allowing time to gradually weaken the demon. Since then, he has been known as the "Demon God."
As time went on, human civilization experienced tremendous growth. Surprisingly, even after the Demon God had disappeared, demons continued to emerge, exhibiting intelligence similar to that of humans. These demons caused significant turmoil for humanity, particularly in the kingdoms located near the World Wall.
In response, the government of that era assembled the strongs individuals and established an organization called The Blitz. This group was formed to combat the demons and protect humanity. Since then, they have maintained their commitment to fighting against these threats.