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Prolouge
“Emergency! Emergency!”
The Empire was thrown into utter chaos.
“Firefly has infiltrated!”
“It’s a national state of emergency!”
“All units, full response!”
On the night of the new moon, when even the moon had vanished from the sky, the Empire trembled in fear at a sudden intruder. The enemy was neither an innumerable army nor a mountain-like horde of monsters.
It was just a single person.
“Find Firefly!”
“Stay sharp! The moment you let your guard down, you’re dead!”
His code name—Firefly.
They say the tiny flutter of a butterfly’s wings can give rise to a colossal storm in the future.
Firefly was a symbol of terror, a top-priority threat said to approach his enemies in silence and ignite the flames of annihilation.
“Find Firefly, now! If we don’t, we’re finished!”
“Damn it! How many countries have fallen to that bastard! Aaaagh!”
In the darkness, Imperial soldiers collapsed mercilessly, one after another. There was no telling who fell first.
“Aaah!”
“Ghk!”
The uninvited guest, using the darkness as cover, struck down the well-trained Imperial troops and vanished without a trace.
“Aaah!”
There was no evidence left behind—only screams of chaos and then silence.
And in the blink of an eye, even their very heart was stolen.
“This is bad! Firefly has taken the core!”
“What?!”
“He stole the core—our army’s barrier has been breached!”
“At this rate, we can’t activate the Empire’s defensive wall!”
“The enemy is breaking throu—aaaargh!”
Bullets poured down from the sky like meteors. As the monster horde finally broke through the walls, the Imperial general ground his teeth in fury.
‘That disaster of a bastard!’
He was a butterfly that brought ruin. Wherever he passed inevitably turned into hell—a veritable hell-butterfly.
His face, gender, and age were all unknown. The Allied Forces of Humanity had tried to capture him for twenty years and failed, and the entire continent had begged and scoured for his whereabouts.
But failure, and more failure.
“Firefly” was the continent’s highest-priority threat and, in a sense, a legend—like a phantom butterfly no one had ever truly seen, and no one had ever managed to seize.
And then, despite all that fame and infamy, Firefly suddenly disappeared. Completely, in an instant.
No one knew why.
He remained gone for a full fifty years. Even so, his name never left anyone’s lips.
“At this point, he’s probably dead, right?”
“An enemy, sure—but a genius. His skill was something else.”
“Who knows if another legend like that will ever appear.”
Yet the Allied Forces of Humanity never let down their guard.
“Never be deceived by him. Firefly is surely lying low, waiting for his chance.”
“Yes. He’s a cunning one—probably trying to lure humanity into complacency.”
Even his disappearance had to be one of Firefly’s schemes. He was always the kind to strike when you least expected it. That belief kept them in constant motion.
“His disappearance must have meaning. Find out what it is and prepare—quickly!”
“Yes, sir!”
The continent wracked its brains, desperately trying to discern Firefly’s true intentions.
‘Firefly, what is your goal…!’
‘What could this disappearance possibly mean…!’
And while they agonized like that for fifty long years—
“Damn it. This lousy wandering curse.”
A man appeared, wiping monster blood from himself.
“I’m lost again.”
The continent’s greatest—and most ill-fated—man had returned.
