Sirin and Kiana are, at their core, different personalities of the same soul.
Though their existence differs vastly from Shiraki and Reverie, both can appear simultaneously in the mysterious space.
Changes in the soul are fully shared between the two personalities.
As if the river of time were flowing backward, the eroded memories in their souls reawaken. The past experiences as Shiraki flood in, surging like a rushing river through Sirin and Kiana's minds.
In the mysterious space, vibrant lights swirl, and the torrent of memories transforms in an instant into warm, gentle spring water under mountain sunlight.
To put it vividly, it's like a consciousness that lost its memories forming new personalities, only to later recover its former self.
Not only are the lost, eroded memories restored, but their respective memories are also synchronized.
Combined with feedback from the mysterious space, Shiraki understood why he found Sirin, Kiana, and Kochou Kanae, and why Kanae didn't recognize him.
The mysterious space "copied" countless versions of his soul, complete and thorough copies across various dimensions!
But Shiraki was just an ordinary person. How could an ordinary soul wander the multiverse unscathed?
Most souls that flowed out from the mysterious space dissipated entirely in the temporal chaos. Only a rare few Shirakis crossed world barriers and survived.
Even those who survived mostly lost their memories.
Someone like "Sirin," retaining a few years of memories, was already extraordinarily lucky. The Shiraki who became Kochou Kanae had his memories almost completely eroded.
All that remained was the core self, etched into the soul.
This core self ensured that even if these Shirakis transmigrated into girls, they wouldn't develop interest in men or romance.
Even if, by some chance, they fell in love, their partner could only be a girl!
And, of course, the soul-deep attitude toward "themselves."
Let's just say Shiraki's narcissism reached a whole new level!
His gaze unfocused, his expression dazed, it took a long while before Shiraki steadied himself, exhaling deeply.
"I didn't expect memory synchronization to feel like this. Good thing the mysterious space is protecting us, or else…"
It wasn't like watching a movie from a third-person perspective but a fully immersive first-person experience, complete with the emotions from those memory scenes.
Without the mysterious space's protection and buffering, the shock of memory synchronization might have led Shiraki to believe he was Sirin or Kiana.
Their "core self" is Shiraki, and their "ego" regained memories of being Shiraki, but as Sirin and Kiana, reborn anew, they are ultimately different from Shiraki.
Gender identity is just one aspect.
Memory and personality, the perception of "self"—these aren't black-and-white issues. Delving deeper touches on the philosophical paradox known as the Ship of Theseus.
Undeniably, they are all Shiraki, all one person!
Along with memory and cognition came the power called Honkai energy—written as Honkai, capable of anything—the authority to manipulate imaginary space, plus mental strength, physical prowess, combat skills, and more.
The mysterious space imposed no limits, but you can't cook without rice.
Ordinary stacking couldn't achieve the profound fusion of Reverie's return to the source.
In the material world, Shiraki lacked the Kaslana family's physique, so he couldn't wield their monstrous strength.
Without the Void Herrscher's core, he couldn't access full spatial authority.
The stacking followed its own rules.
In short, Shiraki gained 100% of Sirin's Honkai energy, about 50% of her spatial authority, and roughly 20% of Kiana's physical prowess.
"The paramecium is actually me!?"
Kiana's eyes widened, her face flashing with unexpected shock before she shook her head vehemently. "No, no, no, this lady is not a paramecium!"
As she spoke, the Kiana who'd been shielding herself with her hip-length white hair relaxed visibly, letting out a relieved sigh.
No longer restrained, she strode confidently toward Shiraki, her long, shapely legs moving freely.
Her lively steps, combined with her current state, were—
Even after rewarding himself every night recently, Shiraki felt a slight rush of blood at the sight of her radiant, flawless form.
Through Shiraki's almost tangible, heated gaze, Kiana clearly sensed its intent.
Bathed in that scorching stare, a strange sensation welled up in her, her cheeks flushing slightly, yet she made no effort to cover herself.
"You've seen me shower so many times in those memories—still not enough?" Kiana poked Shiraki's cheek with a slender finger, her tone playful and coy.
The soft touch of her fingertip felt like silk, the faint, unique fragrance of a girl seeping into his senses. Shiraki shrugged nonchalantly. "I haven't had time to look closely."
Kochou Kanae, watching from the side, blinked in bewilderment, her face full of disbelief.
What's going on!?
Just a handshake, and they're suddenly so open with each other?
Her expression was a mix of complexity and frustration, but seeing Kanae's confusion, Sirin reached out, placing a hand on her rounded shoulder.
The moment their bodies touched, all three froze.
Kiana and Sirin share one soul.
Kochou Kanae's expression turned dazed, her eroded memories restoring. A look of realization crossed her Yamato Nadeshiko-like face.
"So that's how it is…" Kanae said with a wry chuckle.
She stopped hunching to hide behind her long hair, instead stepping forward with cotton-light steps to join the others.
"Is this what they call 'today I realize I am me'?"
"Something's off!"
Before Shiraki could respond, Sirin's voice, still haughty but no longer cold, cut in.
"Hm? What's wrong?" Shiraki cast a curious glance.
Sirin didn't answer, instead naturally taking Shiraki's hand.
Shiraki frowned slightly.
When Sirin and Kanae made physical contact, Kanae's memories as Shiraki awakened, and their respective memories synchronized.
But this synchronization was far less deep than Shiraki's with Sirin. While still first-person, it lacked the emotions of the memory's owner.
And their powers only synchronized to a minuscule degree.
Toying with Sirin's soft hand, Shiraki's face took on a thoughtful look, while Sirin merely glanced at him with her golden eyes, showing no objection or resistance.
After two seconds of thought, Shiraki extended his hand to Kanae, who placed her fair hand in his without hesitation.
Kanae's light purple eyes widened slightly. "This is…"
Since Shiraki held her hand, Sirin understood what was happening too.
If each transmigrated "Shiraki" is a signal source, then the Shiraki of this world is the central base station, with his soul as the hub of the mysterious space~!
Without Shiraki, ordinary signal sources could still transfer data—memories, abilities, physical traits—but only to a limited extent.
Think of it as insufficient bandwidth!
Only by connecting through Shiraki, the main base station, could memories and abilities be shared to the fullest.
This was also a protective mechanism. Without the mysterious space's hub, deep memory sharing could make it impossible to distinguish who was who.
"Perfect! Now I can take down Muzan for good!" Feeling the surging Honkai energy within, Kanae clenched her pink fists. "I'll kill those demons completely!"
With Shiraki's memories fully eroded, the girl born with a near-blank soul into a family of apothecaries saw her adoptive parents as her true family!
Her parents were killed by demons.
But when Kanae tried to return to her world using Shiraki's memories, she felt immense resistance!
"Why?"
At that moment, Shiraki, Sirin, and Kanae were hand-in-hand, their thoughts fully linked.
When Shiraki repeated Kanae's attempt, he encountered the same resistance, followed by feedback from the mysterious space.
The rules of the Demon Slayer world were blocking them. The reason?
Obvious it's Honkai!
That virus-like world mechanism was rejected by other universes, like humans rejecting COVID-19.
If the world's consciousness could speak, it'd probably yell: "What the hell is this!? Stay away! Don't bring that thing into my house!"
"Uh…" The mysterious space's feedback echoed in their minds, leaving Kanae speechless.
She felt the world's rules were right. If Honkai energy were brought back, it'd stick like a plaster you couldn't peel off.
She could easily kill Muzan but would plunge humanity into a greater catastrophe.
"Don't forget about me. An Edel Raid's power is enough to crush Muzan."
Sure, an Edel Raid can only Pact with one person, but they're the same person!
"Right! There's Reverie… wait!"
The sheer volume of restored and synchronized memories meant Sirin, Kiana, and Kanae hadn't had time to process them, so they naturally overlooked something.
But now, with the topic shifting to Reverie, related memories surfaced.
In that instant, the three girls trembled as if shocked, their breathing growing heavy, their eyes misting with a coy haze, looking at Shiraki in the center with an extremely nuanced expression.
No doubt, they'd accessed Shiraki and Reverie's nightly self-reward memories.
Self-on-self action… it's practically perverse!
And Shiraki's speed was godly. The very first night with Reverie, they both lost their innocence.
Talk about swift and decisive!
Of course, if it were them post-memory restoration, they'd probably do the same without hesitation.
"Calling myself a pervert, huh? Well, pervert it is!" Shiraki shrugged calmly, then wrapped his left arm around Kiana and his right around Kanae. Their waists felt as smooth and firm as silk.
Kiana's waist, in particular, was a treasure of human civilization!
Why not hug Sirin?
She's clothed.
Kiana and Kanae exchanged a glance, their fair cheeks flushing with a drunken blush. Jealousy was impossible—they're all the same person, what's to be jealous of?
But as girls now, they felt a touch of shyness, though they'd never refuse Shiraki, even if he wanted to throw an impart right here.
"Wait! This isn't the time for that. I'll play with you anytime later, but the priority is saving Teacher Himeko!"
Her signature white Valkyrie armor materialized, covering her jade-like body. Kiana turned to Sirin.
Sirin's expression was complex. "Injected with the God-killing Spear, even with my cooperation, I can't precisely open imaginary space. The only way…"
Sirin looked at Shiraki.
"Then what are we waiting for? Let's go!" Shiraki's figure vanished instantly.
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T/N: I hope segs would be occasional and not to be take lightly even though that is himself, once every fifty or hundred chapter would suffice. The author should start with world- building first. (I am reading this guys as I am translating).