Killed For 100 Years in Hueco Mundo, Aizen Invited Me To Soul Society!-Chapter 340: Fluctuations In The Data

I couldn’t upload any new Chapters last week because I was out of station on a family vacation. To compensate for that, this week I will be uploading 2 chaps/day for my every fan-fic.

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Soul Society — Twelfth Division, Technology Development Bureau

The Technology Development Bureau was located in one of Seireitei’s blocks — an area not only avoided by most shinigami, but also ranked among the most important facilities in all of Soul Society.

Among the departments housed here, the Reiatsu Measurement Institute played a critical role. For shinigami who operated both in the human world and Soul Society, this institution was indispensable.

Its responsibilities extended to monitoring and analyzing spiritual anomalies, including virtual projections that appeared in either realm, and keeping constant track of the boundary status between worlds.

Normally, this job was handled by Tsubokura Rin and a few trusted colleagues. But today, staff from other branches had also gathered in the Institute to monitor one specific region — Karakura Town.

Just a few quarters of an hour earlier, over a hundred Garganta portals opened in a focused area centered on Karakura Town. And from each one, a single arrancar emerged.

Then, before an emergency command could be issued, every single one of them vanished simultaneously.

To the shinigami, the purpose behind this sudden emergence remained completely unknown. Though Karakura Town was no longer officially designated as a high-density spiritual zone, it still carried heavy historical and tactical significance. After all, whether due to past wars or lingering spiritual resonance, Karakura remained a hotspot that the Soul Society never stopped watching closely.

As soon as the Reiatsu Measurement Institute sounded the alert, all thirteen divisions of the Gotei entered immediate standby mode, awaiting further instructions while the Technology Development Bureau scrambled to analyze the phenomenon.

At first glance, the Soul Society’s response might seem excessive. But anyone familiar with events of the past year would consider it entirely reasonable.

First came Aizen Sosuke — whose betrayal inflicted tremendous damage to Soul Society. And then came Kyo Mazuru — a being even more terrifying than Aizen himself. Both of them had defected, and both had once walked the halls of Seireitei with grace and gentleness. But when they turned, they became monsters. Mazuru’s defeat of Captain Yamamoto in single combat still haunted many.

"Still, those arrancars were strange." murmured Kuna Niko, a bespectacled shinigami with sharp eyes, speaking while idly typing data into a terminal. "There were so many of them, but the quality of their spirit particles was almost identical. And instead of opening one large Garganta, they all opened one each. Isn’t that terribly inefficient?"

Hearing her observation, Hiyosu — the head of the Experimental Test Section, who looked like a mix between a catfish and a hanging bell — chuckled and replied, "If they were subordinate-class Menos Grande, that kind of uniformity in reiatsu isn’t rare."

"But," he continued, his tone shifting, "after they become arrancar? Maintaining that kind of similarity is very unusual. Don’t you agree, Akon?"

He turned toward the horned figure beside him — Akon, the deputy director of the Bureau.

"There are a few plausible theories." Akon responded calmly. "But verifying any of them would require more data."

"Tch, I was hoping we could get ahead of this before the captain comes back," muttered Torue from another terminal, clearly exasperated.

"Forget it," someone scoffed. "Whatever you write up in a rush will just get shredded by the captain anyway."

"Where is the captain, anyway?" Torue asked, glancing toward the office door.

"He was summoned by Central 46." Akon replied. "Something to do with the time Kurosaki Ichigo broke into Soul Society — apparently they’re rehashing the incident when the captain had several members of the Twelfth Division blow themselves up."

The mood shifted slightly at that. Everyone present remembered the brutal efficiency of Kurotsuchi Mayuri. When Ichigo and his comrades were originally branded as travel disasters, Mayuri had equipped Twelfth Division foot soldiers with internal explosives. These poor souls were ordered to get close to the intruders — and then detonate.

To their captain, this wasn’t cruelty. It was merely resource optimization.

"Wait... they’re still on that incident?" one researcher asked in disbelief.

"It’s been over a year." another added.

"Apparently, this new batch of Central 46 nobles just took office," Akon said flatly. "They probably want to make a show of authority. This kind of political move is typical when people are trying to establish power."

After the chaos wrought by both Aizen and Mazuru, the previous Central 46 had been annihilated — twice. Aizen first wiped them out entirely. When replacements were finally appointed, Mazuru destroyed them as collateral during his decimation of the Noble District. Countless noble families were extinguished in that catastrophe.

After the decisive battle in Karakura Town, Captain Yamamoto didn’t even bother refilling the Council immediately. The noble hierarchy had been so devastated that there simply weren’t enough surviving elites to fill the vacant seats.

Only after the Hueco Mundo expedition failed did Yamamoto turn his attention back to Central 46. But with most high-ranking nobles gone, the Gotei had no choice but to turn to lesser noble families to fill the roles — something previously unthinkable.

Though inexperienced and nervous, the new appointees understood the fate of their predecessors. None of them dared declare vengeance against Mazuru or Hueco Mundo. Instead, they chose a safer route — combing through past incidents for scapegoats.

Which led them back to Mayuri.

"Maybe they’ll try to imprison him in Muken." someone muttered, half-joking.

"If it’s the captain, he’d probably enjoy it," another quipped. "He might start analyzing his cellmates and collect samples."

The room erupted into low laughter as everyone kept their eyes on the data streams from Karakura Town.

Tsubokura Rin finally asked, "Hey, that Muken place — that’s the deepest level of the underground prison, right? Is Aizen the only one locked down there?"

"There are a few others." Akon said after a pause. "Not many. But yes — besides Aizen, a handful of individuals have been sentenced to Muken over the centuries."

Muken — the Eighth Level of the Soul Society’s underground prison. The final destination for Soul Society’s worst criminals. Those not sentenced to execution via Sōkyoku, but still considered too dangerous to walk free, were sent there instead. Bound by unbreakable Bakudō, unable to move, blindfolded to rob them of sight — it was less a prison and more of a living seal.

"I heard some of them have sentences exceeding ten thousand years." someone said, voice barely above a whisper.

"That’s right." Akon confirmed. "And one of them... you all should know. That man Azashiro Soya—"

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