Prologue
Location: (A one punch man world where the heroes lost, and the darkness reigns)
The skies were shrouded in darkness, pierced only by the jagged streaks of lightning that illuminated the desolate landscape. A towering, armored figure, clad in obsidian black, strode toward a foreboding fortress.
Z City—once a thriving metropolis filled with life and heroes—had become a lifeless ghost town. Imperial soldiers patrolled its ruined streets, gunning down the last remnants of resistance hiding within burning, crumbling buildings. The armored figure paid them no heed, his focus fixed solely on the fortress ahead.
Two dark warriors, their horns wreathed in flame and spears glinting in the storm's light, stepped forward to block his path. The figure spoke a single command. Without hesitation, the gatekeepers nodded and pulled open the massive gates of darkness, granting him passage. As he advanced, his breath came in deep, ominous rasps, his gaze sweeping over the motionless sentinels flanking the entrance and the skeletal remains littering the bloodstained ground.
At the end of the shadowed hall loomed a massive throne, wreathed in an unnatural darkness. Seated upon it was a figure even more imposing, his burning eyes glowing like the pits of hell. In his grip, he held a decayed skull—its features barely recognizable, save for a few strands of green hair still clinging to it.
"Oh, Tornado… if only you had loved me, if only you had stood by my side," the dark king murmured, his voice tinged with something almost mournful. Then, with a sigh, he crushed the fragile remains to dust and turned his fiery gaze upon the armored figure before him.
"You summoned me, my King?" the mysterious figure intoned.
The dark king chuckled, a deep, menacing sound. "Zarnak and Genocide are busy with their owns mission, so I can't rely on my sons for me just yet ". You served your old master well, Lord Vader. Palpatine, was it? Not much of an emperor in the end—just a frail old man cowering behind his power." His laughter rumbled through the chamber. "And you have served me well, too. That is why I am entrusting you with a most critical mission."
Vader knelt. "What is thy bidding, my King?"
The king's eyes flickered, lost in memories long buried. "There exists a world—a reflection of the one I once called home. Before I became this… monster. Before I wiped out humanity." His voice hardened. "You are to infiltrate this world. Gain the trust of its heroes. And when the time is right… I shall lead my army through the gates of oblivion and claim it as my own."
Vader nodded and rose, turning to depart.
"Wait." The king's voice cut through the silence, halting him in his tracks. "There is something you must know." His burning gaze narrowed. "If you encounter a man called Saitama… tell me. I would very much like to greet him personally."
"As you wish, my King," Vader said, bowing deeply.
With a flick of his clawed hand, the dark king conjured a swirling portal. Its depths pulsed with chaotic energy, the gateway to another world.
"Fulfill your destiny," the king commanded.
Without hesitation, Vader stepped into the abyss.
A moment of silence hung in the air before the dark king leaned back in his throne, a slow, sinister grin creeping across his face.
"Oh, Saitama…" he whispered. "You're in for a big surprise."
Then he laughed—a terrible, booming sound that shook the very foundations of the fortress, echoing into the stormy night.