New fanfic with a new idea... Aizen Sosuke in Solo leveling world as a transcendent Immortal being with Hōgyoku's Sixth Evolution. He is in Choi-jong-In body the guild master of hunter guild who looks exactly like Aizen Sosuke.
….
Soul Society.
The Eighth Layer—Muken, the Abyssal Prison.
Cold and shrouded in darkness, it was a place swallowed by endless silence and death.
Twenty thousand years—a span of time long enough to erase most memories.
In the pitch-black void, a faint silhouette slowly raised its head. Brown eyes, sharp and unfathomable, opened as a low murmur escaped its lips.
"Is the Hōgyoku's sixth evolution… finally complete?"
Twenty thousand years ago, in the earth-shattering final battle against Ichigo Kurosaki, the Hōgyoku achieved its fifth fusion, elevating Aizen Sōsuke to a being beyond the limits of both Shinigami and Hollow—a transcendent existence that pierced through the dimensions.
Unrivaled. Invincible. Absolute.
It should have been a moment worthy of celebration. Yet, when he truly stood above all creation—no longer bound by mortality, no longer 'human'—Aizen was struck by an overwhelming sense of isolation.
The loneliness of one who has no equals.
An existence too distant to be touched.
The Hōgyoku, as if understanding his despair, chose to reject him. It sealed him away—buried in the lowest depths of Soul Society's hellish prison.
Now, after twenty millennia, Aizen's gaze remained as calm as ever. Yet, behind that calmness was the faint trace of scorn—mockery directed at the Central 64 Chambers of the Seireitei, who once believed they could confine him.
As he slowly rose to his feet, a terrifying surge of spiritual pressure erupted, shaking the void. The highest-level seals wrapped around his body began to disintegrate—crumbling like dust.
The Hōgyoku's sixth evolution had surpassed every known limit within Soul Society. Even Aizen himself could no longer define the boundaries of his power.
The space around him rippled violently, as if the surface of reality had turned to liquid. It resembled the opening of a Garganta or a dimensional gate—but this time, it was far more terrifying. Even time itself faltered, ceasing its flow.
Black patterns spread outward, radiating from Aizen's form. They crawled like veins through the eighth level of Muken, expanding relentlessly—devouring the seventh, the sixth, and beyond.
Not just the prison. Not just Soul Society.
Hueco Mundo… the Human World… everything began to tremble.
A massive black vortex spiraled into existence, twisting and distorting all matter.
And in an instant—the Three Realms were swallowed whole.
….
South Korea – Hunters Guild Headquarters
Xx Time, Xx Place
Choi Jong-In, the Guildmaster of the Hunters Guild, sat in his office, the dim glow of his desk lamp casting long shadows across the room. His sharp eyes were fixed on the thick stack of papers before him—a report detailing the recent dungeon anomaly that had sent shockwaves through the entire hunter community.
A routine gate had transformed after hunters had already entered, its rank skyrocketing to a level that could only be classified as an S-rank anomaly. Under normal circumstances, such a sudden shift would spell near-certain doom for those inside. The survival rate should have been abysmally low, yet what he was reading defied all logic.
All of them survived.
Well, almost all of them. A few unfortunate hunters had perished, but that was expected. What wasn't expected was that even relatively weak or inexperienced hunters had emerged alive. His gaze lingered on one particular photograph attached to the report—a young female hunter, her face pale, her eyes wide with shock and lingering fear as she stepped out of the gate.
Standing beside her was a man.
Unlike her, he wasn't afraid. He was calm. Too calm. His expression lacked any trace of unease, like he had simply taken a stroll through the gate instead of barely escaping an anomaly-ridden death trap.
His name was written below the image.
Sung Jinwoo.
The name stirred something in Choi Jong-In. He had already heard the rumors, of course. The man's re-evaluation was scheduled in three days because of a supposed malfunction in the rank-measuring device. But Choi Jong-In wasn't fooled—he knew this was just an excuse to delay the inevitable announcement.
Sung Jinwoo was an S-rank hunter.
It was obvious, and the entire Hunters Association likely knew it as well. Choi Jong-In had even tried to recruit him, only to be dismissed like a mere nuisance. That rejection still lingered in his mind—the way Sung Jinwoo had looked at him, not with arrogance, but with complete indifference.
He exhaled heavily and leaned back in his chair, rubbing his temples. "What the hell are you hiding, Sung Jinwoo?" he muttered under his breath.
And then—it happened.
A sudden shift—so fast, so unnatural—inside his own body.
His mana. His entire mana pool disappeared in an instant.
The overwhelming emptiness hit him like a sledgehammer. It wasn't being drained, it wasn't leaking—it was just gone, as if it had never existed.
His breath hitched. Before he could even process the shock, an unbearable pressure slammed into his chest. His heart clenched violently, twisting like an invisible fist was crushing it from within. His muscles locked up, his lungs refused to take in air. His voice—his very ability to scream—was stolen from him.
What… what is this?!
His body convulsed, and in his desperation, he toppled forward, knocking over the stack of documents and sending them scattering across the desk. Papers fluttered to the floor, but no one would hear.
A searing pain erupted deep within his body. It was unlike anything he had ever felt, even in the deadliest S-rank raids. His insides twisted and tore apart—his organs rupturing, his veins bursting. A wet, sickening sound filled his ears, followed by the sensation of warm liquid dripping down his face.
Blood.
From his nose.
From his mouth.
From his ears.
From his eyes.
He was drowning in his own blood.
His vision swam, darkness creeping at the edges. He tried to fight it, to understand, but the pain was unbearable. His final thoughts were a frantic, fragmented scream in his mind.
What… is… happening… to me?
And then—silence.
His consciousness faded, swallowed whole by the void.
A New Awakening
The lifeless body of Choi Jong-In, once slumped over and drenched in blood, began to rise slowly. His limbs, once rigid in death, moved with an eerie smoothness—like a puppet being lifted by invisible strings.
The blood, which had poured from every orifice, clung to his body in thick rivulets, painting a grotesque picture of his final moments. Yet, something had changed.
The once panic-filled eyes, which had reflected the agony of his mysterious demise, were now cold.
Unnaturally calm.
Like the still, dark waters of a dead sea under the moonless night sky.
A new consciousness had taken hold.
"Where am I? What is this place?"
These thoughts echoed through the mind of the being who now inhabited Choi Jong-In's body. Then, like an unstoppable flood, a torrent of memories surged into his consciousness.
Memories that did not belong to him.
They were disjointed at first, mere fragments of a life that had ended moments ago. But as they pieced themselves together, understanding dawned.
"The human world… but not the one I knew. An alternate dimension? No… perhaps an entirely different world altogether."
That conclusion came with absolute certainty.
The previous world—his world—no longer existed.
And the man now inhabiting this new vessel was none other than…
Aizen Sōsuke.
A faint smirk curled on his lips. Even that damn muken and death had failed to hold him. He was already an Immortal before getting sealed in Muken… but now he was a transcended being.
Suddenly, the air around him shuddered.
A suffocating force—his own spiritual pressure—began to pulse from his newly acquired form. It didn't explode outward but instead wrapped around him in a tight, invisible sphere, pressing down at a level so intense that the very blood covering his skin began to vaporize.
The crimson mist rose, hissing into the air, dissipating into nothingness as if reality itself was rejecting the remnants of the former owner of this body.
Within seconds, not a single drop remained.
Aizen flexed his fingers, feeling the unfamiliar yet competent form of his new vessel. Through the acquired memories, he now understood the world he had stepped into. A world where supernatural forces existed in the form of Hunters, dungeons, and mana.
Fascinating.
Yet, beyond the knowledge that he had entered an entirely new plane of existence, everything else in Choi Jong-In's mind was irrelevant.
Unworthy of his attention.
Aizen Sōsuke had returned.
Review my deaaaaaaaaaaar Readers... Any question ask them away in reviews and u will get the answers in the next chapter.