Faced with Unohana Yachiru's inquiry, Aiyan was just about to say that he planned to use Kaidō · Blessing of Both Hands to modify the structure of his soul, when he heard Reiatsu's voice for the first time.
[The boundary of a Shinigami? Your Reiatsu says that it does not exist. It is only the boundary between Shinigami and Hollow. Why do you need the Hōgyoku? Why do you need the Blessing of Both Hands? You can easily break it with just your own Reiatsu training method — Reigen Kuzushi (Spirit Source Collapse).]
Hearing the prompt, Aiyan still didn't quite understand.
Reiatsu, who had always been the most low-key, was also like a master who sharpens his blade every year.
Perhaps, it had secretly created its own Reigen Kuzushi (Spirit Source Collapse) long ago, but without yet reaching the Shinigami level, it hadn't been revealed.
"Thankfully, I even prepared a backup plug-in for myself."
A smile flashed across Aiyan's eyes beneath the framed mirror.
He now knew that the backup plug-in, the Hōgyoku, was no longer needed — and neither was Kaidō · Blessing of Both Hands.
There are specialties in art.
When it comes to Hadō and Bakudō, Kidō is naturally something he trusts himself with.
But when it comes to Reiatsu training, he chooses to trust his own Reiatsu.
Since his gifted Reiatsu is specifically aimed at the boundary between Shinigami and Hollow, and has created an unprecedented Reiatsu training method in the Shinigami world — the Reigen Kuzushi (Spirit Source Collapse) — then this must be the strongest and most suitable way to break the Shinigami–Hollow boundary.
As expected.
When Reiatsu personally delivered the training method Reigen Kuzushi (Spirit Source Collapse), Aiyan immediately noticed that, after his fight with Unohana Yachiru, the Reiatsu that had stagnated upon reaching the Shinigami limit began to change.
Yes.
His Reiatsu was so competitive that, not only did it create its own Reigen Kuzushi (Spirit Source Collapse) after hitting the bottleneck, but after creating this method, Reiatsu itself began to practice Reigen Kuzushi (Spirit Source Collapse) without him even starting.
Using Reiatsu perception, Observation Reiatsu, Mind's Eye of the Kagura, and other sensory abilities, Aiyan clearly felt his vast sea of Reiatsu surging toward two locations in the soul.
Hakusui and Saketsu.
Reiatsu split in two and quickly condensed into two points of light, like seeds, within the Hakusui and Saketsu.
Soon, with the influx and irrigation of immense Reiatsu, the seeds grew rapidly, becoming like spirit embryos, and then gradually forming into infant shapes.
The sleeping infant in the Soul Sleep had a Hollow mask on its face and red hierro covering its body.
The infant in the Soul Lock held a letter shaped like "A" in its arms and had the wings of a strange creature on its back.
"Is this the function of the Reiatsu training method Reigen Kuzushi (Spirit Source Collapse)?"
"In the Soul Sleep and the Soul Lock, just like constructing a Zanpakutō, you write the Menos Grande infant and the Quincy infant with the essence of the soul, then feed them Reiatsu to help them grow."
"Finally, through the abilities of the Menos Grande infant and the Quincy infant, the soul boundaries are broken, and the souls are exchanged and reorganized."
Aiyan understood.
Although Reiatsu could practice on his own after creating the Reigen Kuzushi (Spirit Source Collapse), without him needing to interfere, it didn't mean he failed to comprehend the method.
In fact, from the moment Reiatsu created the Reigen Kuzushi (Spirit Source Collapse), he already knew everything about it and understood it thoroughly.
It was simply that Reiatsu itself was so driven — creating and training without needing his hand — that it became effortless.
As the Menos Grande infant and Quincy infant took form, Aiyan's understanding of the core essence of Reigen Kuzushi (Spirit Source Collapse) deepened.
The so-called breaking of the boundaries between Shinigami and Hollow promotes the soul to enter a higher dimension.
This process requires continually breaking limits and evolving again and again through soul exchange and reorganization.
It's the same principle as Aizen using the Hōgyoku to push boundaries — deliberately not using Kyōka Suigetsu, forcing himself into danger so the Hōgyoku is compelled to break boundaries and reorganize the soul repeatedly.
As for Kurosaki Ichigo…
He was born with the blood of Quincy, Shinigami, and Hollow, and had already completed this step in the womb.
"Huh? How could this be?"
"I could clearly feel the chasm between me and him just now…"
"Why has it suddenly gone back to what it was before, so that I can't sense anything?"
At the moment when Aiyan's Reiatsu created the Reigen Kuzushi (Spirit Source Collapse) and gave birth to the Menos Grande and Quincy infants within the Hakusui and Saketsu, Unohana Yachiru, still in his arms, suddenly trembled. Her beautiful face showed surprise and confusion, as if she had sensed something.
At that moment, she stared at Aiyan.
This feeling — like looking into the endless sky and sea of stars — was familiar.
Before Aiyan had used Blessing of Both Hands to modify her soul and break the boundary between Shinigami and Hollow, this was the sensation she had when facing him head-on.
But after the modification, she could at least gauge the gap between them — though it remained vast.
Now…
That same immeasurable sensation surged up again.
She could no longer see him clearly.
Even after breaking the Shinigami–Hollow boundary and becoming an existence like Kurosaki, she still couldn't sense anything from Aiyan.
Though held in his arms, it felt as if they were in two different dimensions — like the second and the third.
"Sister Hana, what did you just ask me?"
Feeling the delicate body in his arms tremble, and knowing that the Menos Grande and Quincy infants only needed time to grow, Aiyan withdrew his focus and looked down at Unohana Yachiru.
"Have you broken the boundaries between Shinigami and Hollow? Just now…"
"Aiyan…"
Unohana Yachiru stared blankly into his eyes.
There was no longer the barrier of the seal or the black-framed mirror.
Although she couldn't see his strength clearly, she could see the truest side of him.
Hearing her, Aiyan didn't speak. Instead, he set her down gently, his left hand still on her waist, letting her lean into him. His right hand rose high, index finger extended, pointing toward one of the moons hanging in Hueco Mundo's night sky.
It was the second moon — created during his last visit to Hueco Mundo, using Bakudō · Chibaku Tensei.
Seeing this, Unohana Yachiru seemed to understand his plan and watched him intently, not daring to blink.
Tsksk…
Suddenly, a disturbing twisting sound echoed. At the tip of Aiyan's finger, space wrinkled and rippled, like crumpled white paper smoothed out again without a single crease.
As the spatial wrinkles appeared, strands of Reiatsu light flew out like fox tails, and a red sphere of condensed Reiatsu formed at his fingertip.
Tsksk…
Even before the sphere was launched, the density of spiritual particles within it warped the surrounding space, threatening to twist it into a ball.
"Cero."
...
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