Sōsuke Aizen was a young man adrift.
From the day he first opened his eyes in the Soul Society, he knew he was fundamentally different from everyone else.
He was destined to achieve greatness.
The reason was simple: he was simply too exceptional.
He was so unique that his Reiatsu continuously surged and multiplied just by breathing.
It made him question whether he was even the same species as his peers and classmates.
He truly believed he belonged to a higher echelon of life—some unknown existence standing far above the concept of a Soul Reaper.
Yet, the deeply arrogant young Aizen never let this towering pride slip through his polite facade.
In the private, completely biased evaluation of a certain Mr.
Shimizu, he was simply a naturally evil little brat!
Aizen had originally thought that enrolling in the Shin’ō Academy and becoming a Soul Reaper would finally allow him to find his own kind.
But the crushing loneliness remained.
His classmates, and even the esteemed instructors, possessed abilities and worldviews that fell completely short of his own.
Furthermore, the academy’s curriculum was painfully shallow.
It only took him half a semester to independently master every single textbook and theory available to him.
Driven by an insatiable thirst for knowledge and a desire to understand the true nature of the world, he began to move in the shadows.
Every night, long after curfew, Aizen would sneak into the academy’s library to devour its archives.
When those books could no longer satisfy him, he began breaking into the faculty offices, hoping to uncover their private research notes and learn highly advanced Kidō.
That routine continued until he met a newly appointed instructor named Haru Shimizu.
This man was entirely an anomaly.
Haru saw right through Aizen’s disguise.
He recognized the boy’s terrifying potential and towering arrogance—yet he completely brushed it off.
He treated Aizen with casual warmth and even went out of his way to teach him some of his own closely guarded techniques.
But Aizen was not the type of person to easily open his heart to anyone.
He had his own pride, and his own ambitions.
Recently, Haru had imparted a few minor, yet brilliant tricks regarding the manipulation of Reishi.
It fascinated the studious young man.
Aizen was absolutely certain that Haru had recognized his exceptional nature.
While this realization made him slightly tense, it also ignited a strange, unfamiliar sense of validation.
Perhaps he wasn’t the only anomaly in this world after all, because he simply could not figure Haru out.
In fact, he highly suspected Haru knew exactly what he was doing during his midnight excursions.
Why else would the man proactively teach him the camouflage Kidō, Kyokkō?
Armed with that spell, young Aizen’s nocturnal research became virtually undetectable.
Having completely exhausted the academy’s resources, he gradually shifted his sights toward the demographic he despised the most: the Great Nobles.
But before infiltrating their estates, he needed to satiate his burning curiosity regarding his newest discoveries.
The Reishi manipulation theories Haru had casually tossed his way had provided a profound sense of satisfaction, swinging open the doors to an entirely new realm of power.
He soon realized that if he truly wanted to master these mechanics—to the point where he could effortlessly dismantle an opponent’s Kidō mid-cast—he needed test subjects.
And those subjects…
had to be alive.
Conventional concepts of morality meant absolutely nothing to Aizen.
Would a human being fall to their knees and weep, begging for forgiveness after accidentally stepping on an ant?
If taking a life was a necessary stepping stone on the path to ultimate power, Aizen wouldn’t hesitate for a single second.
He was supremely confident in his own strength.
Based on his careful observations, the vast majority of the academy’s instructors—with the sole exception of the utterly unfathomable Mr.
Shimizu—were no longer a match for him.
The night was pitch-black, the silence in the dormitory broken only by the rhythmic snoring of his roommates.
Lying flat on his back, Aizen suddenly opened his eyes.
After sweeping the room with his Reiatsu to confirm everyone was deeply asleep, he quietly sat up.
Using a basic Kidō, he crafted a perfect illusion of himself sleeping on the futon.
Then, he cast Kyokkō and slipped out of the academy completely undetected.
Much like his mentor, Haru, Aizen deeply appreciated the Shin’ō Academy’s geographical location.
Situated just outside the heavily guarded walls of the Seireitei, it was the perfect staging ground for illicit activities.
Aizen moved like a phantom, effortlessly bypassing the sporadic Soul Reaper patrols in the inner districts of the Rukongai.
Due to the rampant rebel activity, security outside the Seireitei had significantly tightened.
He was confident, but never reckless.
Because of this, his initial test subjects weren’t going to be Soul Reapers.
Instead, he targeted those who shared his origins, yet lacked his transcendent talent—the ordinary commoners.
It was the most logical choice.
Even though he possessed the power to easily assassinate a seated officer, there was no need to draw the ire of the Gotei 13 at this stage.
Therefore, these entirely defenseless civilians were his ideal prey.
He soundlessly pushed open the door of a dilapidated shack.
Drawing his Zanpakutō, he stepped inside.
The pale moonlight filtering through the torn paper windows illuminated the face of his waiting sacrificial lamb.
He recognized her.
It was the frail old woman who had hobbled past them on the street that day—the day Mr.
Shimizu had taken him out to ‘experience the noble lifestyle’ while squatting on the curb eating cheap steamed buns.
Aizen could sense the faint, erratic trickle of Spiritual Pressure leaking from her body.
For his current stage of research, she was the absolute perfect specimen.
He raised his blade.
All he had to do was swing it down, and he would have his first harvest.
Yet, the steel froze in mid-air.
“Do not grovel before the strong, and do not trample upon the weak.
It sounds simple, but it is incredibly difficult to truly practice, Sōsuke!”
Haru’s profound words echoed relentlessly in his ears.
The edge of his Zanpakutō gleamed coldly in the moonlight.
Young Aizen knew with absolute certainty that if he let this blade fall, he would become no different from the corrupt, oppressive nobles he so deeply despised.
‘If overturning a corrupt system requires sacrificing the lives of the weak to pave the way, then what fundamentally separates the revolutionaries from the corrupt oppressors they seek to destroy?
On the scales of life, wouldn’t their disregard for the weak simply make them another iteration of that same rot?’ Aizen silently mouthed the words his teacher had imparted to him that day.
His grip on the hilt tightened so fiercely that his knuckles turned stark white and the veins in his hand bulged.
He was a creature who viewed conventional morality as a joke, who held absolutely zero reverence for the rules, and who could ruthlessly disregard the sanctity of life.
Yet, he had finally found someone he could call a peer.
If Mr.
Shimizu discovered that he had resorted to slaughtering innocent commoners like a street thug, would the man still look at him with that same profound, acknowledging gaze?
Was he really going to give up on this perfect test subject just like this?
At this stage in his life, young Aizen didn’t harbor the grand, apocalyptic ambition to shatter the heavens and transcend all creation.
The only thing driving him forward was an agonizing, suffocating loneliness.
But now that he realized he was no longer walking that solitary path in the dark, the scales in his heart quietly, imperceptibly shifted.
Finally, a soft sigh drifted through the empty shack.
Aizen turned away.
A faint, complex smile curved the corners of his lips as he smoothly sheathed his Zanpakutō.
He offered a polite, silent bow to the sleeping old woman—who remained blissfully unaware that she had just brushed shoulders with death—before re-engaging Kyokkō and melting back into the shadows.
A long moment passed.
Suddenly, the air itself seemed to tear open like a physical curtain.
Haru Shimizu, clad in the sleek, form-fitting black uniform of the Executive Militia with only his eyes visible, stepped out of his own Kyokkō camouflage.
He let out a quiet breath.
“You didn’t let me down, Sōsuke.”
Haru was incredibly satisfied.
He firmly believed his ideological guidance was paying off.
This was the successful first step in gaslighting—er, educating—the future mastermind.
But a man as insatiably ambitious as Aizen was never going to just stop here.
Haru knew he had to continuously lay down the tracks if he wanted to guide this runaway train.
Therefore, Mr.
Shimizu decided it was time to reward his model student.
He was going to take Aizen out to do something truly massive.