Elsewhere in the ruined cityscape, Akiyama Ren hovered silently in the air, his divine pressure slowly receding like a tide withdrawing from the shore.
Even the heavens, which had trembled beneath the weight of his wrath, seemed to exhale in relief.
Ren turned his gaze to Miwa Kasumi, crumpled on the ground, her uniform torn and stained with blood. Her breath was shallow, her spirit dim. With a subtle gesture—just a gentle curl of his finger—slivers of metal embedded in her body began to levitate and withdraw, shimmering under the moonlight like stardust.
Then, he raised his hand. A burst of emerald light radiated from his palm—pure, ancient, healing magic of the highest caliber. The glow enveloped her entire body like a cocoon.
In an instant, Miwa's injuries vanished.
Wounds stitched shut without a trace, broken bones reknitted, torn muscles regenerated. Even the internal scars—old strains from relentless sword training—were washed away. Her stamina returned to its peak. Her soul, however, remained asleep, adrift in unconsciousness.
Ren sighed softly.
"She'll be fine."
With a flick of his hand, a crystalline barrier formed around her—gentle yet unbreakable—and then, like a wraith ascending to the heavens, Ren soared skyward.
Above Shinjuku, he paused. From the edge of the clouds, he surveyed the carnage below. Curse Spirits filled the streets like vermin in a plague, feasting on fear and blood. His expression twisted in disgust.
"…Filth."
With a single upward motion, he pointed toward the sky.
A rift tore open in the atmosphere, and a massive gravitational singularity emerged—pulsating with void energy.
The Void Devourer, born of the Void God ability, expanded with a low, cosmic hum. Its pull was immediate and absolute.
Curse Spirits screamed and twisted as they were ripped from the earth, consumed one by one.
But not a single building was touched. Not a single civilian harmed. The black hole's hunger was… selective.
The Jujutsu Sorcerers still fighting on the ground halted, their weapons trembling in awe.
Yaga Masamichi shielded his eyes, stunned. "Who… Who is that?"
Mei Mei, her usual cool demeanor shaken, stared up at the sky, voice low. "I've never seen him. But that presence... That power... It wasn't just cursed energy—it felt like a god descending."
Yaga exhaled in relief. "Whoever he is, he's not a Curse Spirit. That alone is good enough for now."
Mei Mei gave a rare smile, watching the black hole silently purge the battlefield. "Judging by his actions, he's not our enemy. But if he is… we're all finished."
At that moment, Shoko Ieiri appeared beside them, arms crossed. "First Gojo Satoru shook the foundations of the Jujutsu Society... now this? The old men in Kyoto will choke on their tea."
But Ren was already on the move.
High above the city, while his singularity continued to harvest the curses below, he activated a second ability—Raphael, Lord of Wisdom.
(It's a bit confusing here, Gluttonous King Beelzebub devours and analyzes prey, Void God Azathoth is a combination of Gluttonous King, Raphael, Covenant King Uriel, and Merciless King Ciel (later evolved name of Raphael))
Invisible threads of data began flowing into him, connecting to every Jujutsu Sorcerer in the region.
One by one, their Innate Techniques were broken down, analyzed, and catalogued.
Gojo's Limitless Void. The Zen'in clan's Projection Sorcery. Hakari's Idle Death Gamble.
No secret was safe.
Ren's mind was alight with information—complex, ever-shifting matrices of cursed techniques. He was moving faster than thought, faster than sorcerers could react.
Because he had a goal.
The Rimuru Template had made him temporarily omnipotent… but that power was borrowed. Temporary. A crutch. And Akiyama Ren had no intention of staying weak.
He needed a legacy of his own.
Thus, he issued a command to the Raphael, Lord of Wisdom:
Integrate. Synthesize. Evolve.
The system obeyed. In a surge of divine energy, all the techniques were reforged into one.
A singular, universal Innate Technique.
Alpha-Omega Codex.
The origin and end of all things.
Alpha: The beginning, the spark of every technique ever born. Omega: The culmination, the terminus, the perfected result.
Together, they formed the Codex—a living grimoire of cursed energy that allowed Ren to wield any Innate Technique that had ever existed. Past, present, or even future.
As long as a technique had been imagined, Alpha-Omega Codex could manifest it.
It was, in a word, transcendent.
Even Yuta Okkotsu's celebrated Copy Technique—once thought unbeatable—now paled in comparison.
But Ren didn't stop at sorcery. The Raphael, Lord of Wisdom also absorbed the muscle memory and combat flow of dozens of martial artists, crafting a flawless style customized to his body and fighting rhythm—a seamless blend of pure cursed combat.
Only one piece remained incomplete.
Among all the sorcerers in Shinjuku, only Gojo Satoru had cast a Domain Expansion—Unlimited Void. Thus, only one domain could be copied.
Still, Akiyama Ren was more than content. Even if the borrowed Rimuru Template faded now, his current strength—his own power—would rival, if not surpass, the strongest sorcerer alive.
The Curse Spirits that plagued Shinjuku had been completely devoured. Not a trace remained.
Ren moved without hesitation, soaring like a bullet from the sky. His next target: Kyoto.
Another black hole bloomed above the city as Void God opened a rift. Once again, an entire swarm of Curse Spirits was pulled into the abyss, erased from existence.
As they vanished, Ren activated the Raphael, Lord of Wisdom anew.
Another scan. Another round of assimilation. Another batch of Innate Techniques pulled into the ever-growing archive of Alpha-Omega Codex.
On the ground, the reactions were no less explosive than in Shinjuku.
"No way... that's ridiculous!" Zen'in Mai shouted, slack-jawed as she looked to the sky.
"That man..." Kamo Noritoshi muttered, his usual aloofness cracking as his eyes widened, "he's more dangerous than Gojo Satoru."
But Nishimiya Momo, calmly hovering on her broomstick, smiled brightly. "Why worry? At this rate, the Curse Spirits will be gone before sunset."
Standing shirtless amidst the rubble, Aoi Todo watched in silence. His fists clenched, not in fear—but in anticipation.
In under five minutes, Kyoto was purged.
Then Ren turned again—this time to the heart of sorcery itself: Tokyo Metropolitan Curse Technical College.
Tonight's Night Parade of a Hundred Demons had been a diversion—an elaborate smokescreen by Suguru Geto to lure Japan's strongest Jujutsu Sorcerers away from the school.
His goal: to steal Rika Orimoto, the special grade Curse Spirit bound to Yuta Okkotsu.
But as Geto approached the barrier around the school, so did Ren—descending like divine judgment.
A thick black dome encased the campus: Tent—a barrier technique that concealed locations and distorted perception. Normally used for stealth or defense, it could delay even high-level Jujutsu Sorcerers.
Ren landed softly atop the dome. A moment passed.
Then—crack.
The Tent shattered like glass under his foot, its cursed seals unraveling into motes of light.
Inside, chaos had already erupted.
Yuta and Rika clashed violently with Geto, while Maki Zen'in, Toge Inumaki, and Panda lay bloodied and broken on the battlefield.
Ren didn't even glance at Geto.
Instead, he flicked his wrist—casting an emerald surge of healing magic.
Light engulfed Maki, Toge, and Panda. Broken bones reassembled, gashes sealed, blood retreated into healed flesh.
They stood again, fully restored—bewildered.
"…This isn't Reversed Cursed Technique," Maki muttered, adjusting her shattered glasses, now miraculously whole.
"Salmon. (No doubt)," said Inumaki, voice low but certain.
"This guy… might be even more monstrous than Gojo," Panda murmured, eyes locked on the sky.
Meanwhile, Suguru Geto realized something was wrong.
He summoned a horde of Curse Spirits to buy time and fled into the ruins—but it was too late.
Ren raised a hand—and with a snap of his fingers, a transparent, shimmering cube appeared around Geto.
A prison. Timeless. Absolute.
"…What is this?" Geto's voice cracked.
Infinite Prison—a skill borrowed from another world, once used to seal the Storm Dragon Veldora. A dimensional construct with no beginning and no end.
Geto struck the walls in vain. The prison didn't even ripple.
***************
I forgot to mention this in the first chapter but to put it nicely, the MC is morally grey. Also, please don't question it when the characters do not act as per their personas from respective verses. That's just one of the creative aspects granted to fan-fic authors. Do tell me how you're finding the story after reading up to Chapter 5.
Oh, and any corrections for errors made would be appreciated. I don't know much of the lore but I hope I have done and will do a good job.
PS: Is the Alpha-Omega codex a good name or do you have a better idea?