After finalizing his agreement with Tessai, Su Xiuyu decided to stay in Karakura Town. Since his goal was to master Kido, he and Harribel found a quiet place nearby to settle into.
Now fully transformed into a Shinigami, Su Xiuyu could clearly perceive the reishi—spirit particles—in the air, scattered like invisible stardust throughout the real world. The sensation was familiar, akin to the natural energy he once sensed as a shinobi. Yet, reishi was easier to manipulate, more fluid, more obedient.
His soul had undergone a qualitative evolution. In a world built upon spiritual power, this transformation had opened new doors. He could feel it—he hadn't just stepped into a new class of existence; he'd ascended. And this was just the beginning.
Eventually, he planned to bring others—Madara, Izuna, and even the younger Uchiha generation—into this realm of power. Su Xiuyu was becoming a cosmic tree, drawing nutrients from every world he touched, growing broader, stronger, and more formidable. And like any tree, the fruit it bore would depend entirely on its root system—on his will.
If his goals leaned toward conquest, the ninja world could easily become an army of interstellar locusts. Fortunately, Su Xiuyu had no such ambitions. He didn't care for domination. Strength was his obsession—not power for the sake of ruling, but power for the sake of possibility.
That night passed quietly.
In the room next door, Harribel fell asleep with a rare, subtle smile on her lips. Su Xiuyu didn't notice—but if he had, he might've been surprised by the serenity she now allowed herself to feel.
---
The next morning, Su Xiuyu began formal study under Tessai. They started with the fundamentals: low-level Hadō.
"Hadō, or the Way of Destruction," Tessai explained, "is spiritual particle manipulation used for direct offense. Think of it like an arcane strike molded through will, spiritual pressure, and incantation."
"With your level of spiritual power," he added, "everything under level 30 should be child's play."
He raised a hand and calmly demonstrated the first technique.
"Hadō #1: Shō—Push."
As a responsible teacher, Tessai kept his tone serious and instructional.
"How does it feel?" he asked.
"Simple." Su Xiuyu raised a hand. "Hadō #1: Shō."
A burst of force shot from his palm—cleaner, more powerful than Tessai's own.
The older man's face twitched slightly. It was only the first spell. No big deal. He kept going.
"Hadō #4: Byakurai—White Lightning."
"Hadō #11: Tsuzuri Raiden—Electric Discharge."
"Hadō #12: Fushibi—Hidden Fire."
"Hadō #31: Shakkahō—Red Fire Cannon."
"Hadō #33: Sōkatsui—Blue Fire, Crash Down."
Su Xiuyu matched each demonstration in stride, learning instantly. To him, the essence of Kidō wasn't much different from ninjutsu—both were methods of molding and directing energy. Chakra or reishi, it was all about precision and intent.
From a structural standpoint, he found the ninja combat system more intricate and versatile. But the average Shinigami had greater spiritual endurance and raw firepower. Still, regular Shinigami were fragile, and Su Xiuyu knew how easily they could fall.
Tessai's emotions fluctuated wildly during the first lessons—from surprise, to shock, and finally to numb acceptance. His pride was quietly crumbling.
By the time Su Xiuyu cleanly executed Hadō #33 on his first try, Tessai felt like a retired chef watching someone cook a Michelin-starred dish using only intuition.
"This… this isn't learning," Tessai muttered to himself. "This is cheating."
But Su Xiuyu remained humble—well, relatively. To him, this pace felt normal. After all, it wasn't his first time mastering a new energy system.
"Were you really human before?" Tessai asked, eyes narrowing in suspicion.
"You saw me become a Shinigami with your own eyes," Su Xiuyu said, grinning. "But yeah—I was pretty strong even as a human. Just ask your shopkeeper. Right, Kisuke?"
Urahara Kisuke, who had been watching quietly, offered a tired smile. His ego had taken too many hits in the last week for him to respond with anything but grace.
At least, he thought, Su Xiuyu keeps his promises. And truly strong people don't lie about petty things.
---
By the third day, they moved on to high-level Kidō.
"Hadō #54: Haien—Abolishing Flames."
"Hadō #57: Daichi Tessei—Earthly Tremor."
"Hadō #58: Tenran—Orchid Sky."
"Hadō #63: Raikōhō—Thunder Roar Cannon."
"Hadō #73: Sōren Sōkatsui—Twin Lotus Blue Fire."
"Hadō #88: Hiryū Gekizoku Shinten Raihō—Flying Dragon Strike, Thrusts through Heaven's Thunder."
Su Xiuyu maintained his uncanny speed. Although he wasn't as instantly fluent in these higher-tier techniques, his grasp was still absurdly fast. For most Shinigami, even glimpsing Hadō #88 was a milestone of achievement.
Yet here he was, casting it by day three.
It was almost offensive.
The average Shinigami trained at the Shin'ō Academy for six years. Even captains spent decades mastering their art. The idea that someone could waltz in and leapfrog to the top was borderline sacrilegious.
But Su Xiuyu wasn't someone.
"This rate… you'll drain all my knowledge in a week," Tessai sighed. His pride as a former Grand Kidō Chief was in shambles.
That evening, Su Xiuyu offered something back.
"I think it's time I started teaching you," he said. "Let's start with how to sense spatial fluctuations."
Tessai blinked. Then he pulled out a notebook, eager as a student.
For all his titles, Tessai was also a lifelong scholar. And space—unlike other branches of Kidō—was underdeveloped in Soul Society. Most of their travel required Gates because long-distance spatial manipulation was considered impossible without them.
But Su Xiuyu? He could bend space like it was soft clay.
The Shinigami techniques had their limits—not from lack of potential, but from a lack of research. Tessai had always dreamed of pushing those boundaries, but after his exile, that dream began to fade.
Until now.
Su Xiuyu's casual mastery of spatial techniques was a revelation. And Tessai could feel it: the long-cold embers of his ambition were igniting again.
As a former Grand Kidō Chief, Tessai had always dreamed of creating his own original Kidō—of leaving a mark in Soul Society's long history. But the tools, time, and environment had been stripped from him the day he followed Kisuke into exile.
-----------
"I'm going to open a spatial loop—one that connects its beginning to its end," Su Xiuyu explained. "Inside, you'll experience an endless fall, continuously cycling through the fabric of space. It's the purest way to feel spatial rhythm with your own body."
"You can... link a space channel into a closed loop?"
Even Urahara Kisuke, who had remained silent for most of the session, couldn't hide his astonishment. His usual laid-back expression faltered.
Ordinary Shinigami might have missed the implications, but Kisuke was no ordinary man—he immediately grasped what Su Xiuyu had just said. This wasn't teleportation. This was space being shaped like a Möbius strip—looping and flowing infinitely.
"Can I try it too?" Kisuke asked, a little too eagerly. His voice was a mixture of scientific curiosity and suppressed giddiness, as though he were about to unbox a new forbidden artifact.
Su Xiuyu smirked.
"Of course—not."
Kisuke's smile dropped like a stone.
"I'm doing business with Tessai, not you, Mr. Urahara," Su Xiuyu said, clearly enjoying the look of mild betrayal on the infamous shopkeeper's face. "You'll have to pay extra."
Ignoring Kisuke's grumbles, Su Xiuyu activated the looped portal. Space shimmered like water, folding inward. Tessai stepped forward—and promptly fell into an endless, spiraling descent.
Half a day later, Su Xiuyu finally ended the loop.
The moment Tessai hit solid ground, he doubled over and vomited violently. Whatever spatial enlightenment he had achieved was now being drowned in stomach acid.
"You alright, Tessai?" Su Xiuyu asked, casually stepping out of the splash zone as another wave of gastric horror spewed from the ex-grand priest.
"I... urp... I think I felt something…" Tessai muttered, before dry-heaving again.
Su Xiuyu winced. "Yeah, that's enough for today. No one's learning anything in this condition."
---
By the third day, Tessai had fully recovered and resumed training Su Xiuyu with his usual intensity.
"Did you manage to sense any spatial fluctuations during your... fall?" Su Xiuyu asked, genuinely curious about Tessai's learning curve.
"I did—barely," Tessai replied with honest frustration. "But it's not enough. Once I'm done teaching today, can I... try again? Please, Mr. Su Xiuyu."
He wasn't even pretending to be polite anymore. Seeing Su Xiuyu casually stroll around the garden after crafting a spatial anomaly had shattered any sense of pride he once had.
Su Xiuyu chuckled. "Sure. Drop by whenever. Once you grasp the fluctuations, the rest becomes easier. Think of it like learning to hear a beat before dancing to it."
"Thank you. Truly."
That day's lesson was the next frontier of Kidō—something even most captains never dared to attempt.
"Today we begin Hadō #90," Tessai announced, his tone grave. "This is one of the most devastating techniques in existence. Under no circumstances should it be used casually. If cast in the human world, the consequences could be catastrophic."
Su Xiuyu nodded. "Understood."
"The spell is called Kurohitsugi—the Black Coffin," Tessai continued. "And we begin with the full incantation."
His voice dropped into a ritualistic cadence.
> "The faintly glimmering emblem of chaos. The arrogant one who denies the heavens—shatter! Collapse! Paralyze! Screech! Awake from eternal slumber!
Steel princess crawling in clay, inflict pain upon thyself and rise—rebound, merge, and spiral to the ground. Acknowledge thy powerlessness…
Hadō #90: Kurohitsugi!"
Black energy swirled into a square-shaped coffin of pure force. Within it, countless spears of energy pierced through space and anything within.
Su Xiuyu blinked.
"That chant is longer than a Water Dragon Jutsu with 44 hand seals," he muttered. "Even Kakashi could finish a jutsu faster."
Still, the power couldn't be denied. He'd seen this spell in the past—Aizen had wielded it effortlessly, annihilating Komamura Sajin in seconds.
Although Sajin ranked on the lower end of captain-class power, the Black Coffin's lethality was undeniable. And with Shinigami preferring close-quarters combat or Zanpakutō abilities, few truly mastered this spell.
"There's also Bakudō," Tessai added. "Binding spells can pin an opponent before casting a high-level Hadō. Otherwise, they'll just dodge. That's why Kidō isn't the mainstream in combat—it's too slow, too technical, and requires ridiculous control."
Su Xiuyu nodded. "Makes sense. Powerful, but not practical for most."
Then came the moment of truth.
Su Xiuyu stood in the center of the barrier and mimicked Tessai's hand movements and chant. He closed his eyes, focused his spiritual pressure, and called:
"Hadō #90: Kurohitsugi!"
The spiritual pressure fluctuated—and then fizzled. The spell failed to manifest.
Tessai exhaled in relief.
Finally.
Su Xiuyu had been devouring spells like candy for days. Seeing him fail—even once—was oddly comforting.
He almost smiled.
But Su Xiuyu didn't seem fazed. "Okay, again."
This time, he spoke the chant clearly, layer by layer, amplifying his spiritual pressure as he spoke. The energy condensed faster, denser—
Until halfway through the formation, the coffin suddenly began to shake violently. The spiritual energy twisted unnaturally, bubbling like magma ready to explode.
Tessai's eyes widened.
"Get down, now!" he shouted.
Su Xiuyu blinked. "Hm?"
"Sir Su Xiuyu—move! That thing's unstable! If it detonates—this barrier won't hold!"
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