Long ago, there lived a Demon King whose sole ambition was to bring the entire continent under his rule. He was infamous for his cruelty and brutality, a tyrant who slaughtered without mercy. Men, women, and even children were shown no compassion; anyone who stood in the path of his conquest was killed without hesitation. Wherever he set foot, death followed in his wake.
The inhabitants of the continent did not remain passive in the face of the demonic invasion. In desperation, they forged a grand pact known as The Alliance of the Four Major Races, commonly referred to as the Alliance of Four or A4. This alliance united humans, elves, beastmen, and dwarves with a single purpose: to halt the advance of the Demon King and end the invasion of the demon race. Yet despite their combined strength, every attempt to stop him ended in failure.
Even when opposed by all four major races, the Demon King remained victorious. Step by step, he tightened his grip on the continent, conquering village after village, city after city, and eventually entire kingdoms. One land after another fell beneath his dominion, until resistance itself began to feel meaningless.
The continent descended into utter ruin. Death spread unchecked, and famine plagued every nation. Many would later say that the world at that time resembled hell itself, as though the underworld had risen to consume the living. Half of the human population perished in brutal and merciless ways, while countless human kingdoms were reduced to rubble. The elven realms were burned to ash, leaving the elves without a homeland, and the dwarven race was driven to the brink of extinction.
Such was the Demon King's cruelty that legends arose around his very presence. It was said that wherever he walked upon green soil, the land turned black, as if rejecting him. The sun refused to shine upon his path, and life itself withered before him. Because of this, he was given a name that would echo through history and haunt the continent forever: the Walking Calamity.
Many wondered why the Demon King sought to conquer the entire continent with such single-minded hatred. The answer was, in truth, disarmingly simple. He believed with absolute conviction that the demon race was superior to all others and that only demons were worthy of ruling the world. In other words, he despised every race that was not his own. He was, without question, a racist.
When the continent stood on the verge of total subjugation, a miracle finally occurred. The gods, long silent, bestowed divine blessings upon the Alliance of Four. From these blessings emerged a party of heroes, chosen to bring an end to the Demon King's invasion and the endless suffering it had caused.
The party consisted of Adnin, a human warrior who wielded a holy sword forged directly by the gods themselves; Linora, a human priestess blessed with sacred power capable of healing any wound; Sageon, a human mage with an affinity for all elements; Kina, an elven ranger whose divine blessing granted her senses far surpassing those of any other race; Thoriq, a dwarven paladin clad in armor and shield said to withstand thousands of demonic strikes; and finally Taka, a beastman druid endowed with overwhelming physical strength and the ability to transform into animals.
These six became the vanguard of the counteroffensive. Under their leadership, the tide of war slowly began to turn. Demonic forces were pushed back, occupied territories were reclaimed, and one by one the Demon King's commanders fell. For the first time since the war began, hope returned to the continent.
The Demon King, however, did not ignore these developments. Upon learning of the heroes' victories, he personally gathered his forces and marched to annihilate them. By fate or coincidence, the two armies met in a valley nestled between two towering mountains, a place known then as the Valley of Grace. That valley would soon become the stage for the final battle.
The Demon King stood at the forefront of sixty thousand demonic soldiers, clad in black armor and wearing a helm adorned with two horns. As far as the eye could see, demonic banners filled the horizon, and the oppressive weight of his presence alone felt like a divine judgment ready to be passed. Opposing him were the heroes, leading thirty thousand soldiers of the alliance. Though outnumbered, the allied forces placed their unwavering faith in the hero party, believing they would defeat the Demon King and restore peace to the continent.
The battle raged for days within the valley. Under the scorching sun and relentless rain, steel clashed against steel and magic collided with magic, while screams of agony filled the air. The earth drank deeply of blood, and the sky bore silent witness to the carnage below.
After four days of unending battle, even the Demon King could no longer endure. His body was covered in wounds; his left arm had been severed, a massive hole gaped in his chest, and a sword was driven deep into his neck. Black blood poured endlessly from his injuries, yet he remained standing, a sight so terrifying that it etched itself into the hearts of all who witnessed it. Still, no being could withstand such wounds forever. At last, the Demon King collapsed.
His body grew heavy, and his vision blurred as consciousness began to fade. Through the haze, a voice reached his ears. When he looked up, he saw Adnin standing over him, holy sword in hand.
"This is the end for you, Demon King," Adnin said coldly. "Do you have any last words?"
Even with a blade piercing his neck, the Demon King found the strength to laugh. "Haha… that was truly enjoyable."
With those final words, Adnin severed the Demon King's head. Black blood sprayed across the battlefield as head and body were torn apart, and with that single strike, the war came to an end.
The alliance emerged victorious, and the Demon King's reign was finally broken. He and his sixty thousand soldiers were annihilated, but the victory was purchased at a terrible cost. Twenty-seven thousand four hundred allied soldiers lay dead. Adnin lost his right eye and left arm; Sageon's mana core was destroyed, forever stripping him of the ability to use magic; Thoriq met a gruesome end, his armor shattered, his shield crushed, his abdomen split open and his organs spilled upon the battlefield; Taka lost one of his legs; and Kina suffered a severe stab wound to the abdomen, though her life was spared.
Linora bore no physical wounds, yet her mind was irreparably broken. The horrors of the battlefield—oceans of blood, piles of corpses, severed limbs, and scattered organs—were burned into her memory forever. She descended into madness, and not long after returning to the church, she took her own life.
Because of the sheer horror of that final battle, the valley was renamed. The Valley of Grace became known as the Valley of Mourning.
Days passed, and years followed. Yet the Demon King remained a living terror in the memories of every race. Parents invoked his name to frighten disobedient children, warning them that if they did not behave, the Demon King would come to claim them.
Fifteen years have passed since the Great War. Though the Demon King was defeated, war itself never truly ended. The Alliance of the Four Major Races eventually collapsed; as in so many old stories, once the common enemy was gone, division followed. Old grudges resurfaced, trust eroded, and former allies turned their swords against one another. The peace they had fought so desperately to achieve shattered completely.
Now, you may be wondering why I have told you all of this.
Because
"Why the hell did I reincarnate as a human?"
Yes.
That is me.
The racist Demon King, reborn as a human, fifteen years after my death.