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System Life Space
Pure white brilliance filled the surroundings—sacred, pristine. At the center stood a bed where Kaido lay motionless.
The Demon Slayer System materialized as a luminous form beside the bed, observing his near-death state with profound anguish.
Though protection protocols had preserved his life and soul, he remained critically weak—requiring extensive treatment time.
His body bore catastrophic damage, demanding significant restoration effort.
[Host... was it truly worth pushing yourself this far? Sigh...]
After that lament, the formal process began.
[Ding! This system will now activate virtual embodiment to treat the host! Embodied virtual character will be extracted from host memories. Extracting...]
Instantly, hundreds of anime and game characters from Kaido's past life materialized as 3D projections—floating in midair.
Asuna, Rem, Raiden Shogun, Kamisato Ayaka, Kurumi Tokisaki, and hundreds more.
If Kaido saw this, he'd probably prefer staying unconscious—or deeply regret never formatting his "study materials."
[Memory extraction successful!]
[Embodying virtual character: Kurumi Tokisaki!]
The luminous form began transforming. A silhouette gradually took shape.
Finally, the light dispersed. The Demon Slayer System had embodied itself as a young woman in a high school uniform with a short skirt.
Long bangs concealed her left eye. Black hair fell past her shoulders, two strands bound forward across her chest. Black stockings wrapped long legs in aesthetically pleasing perfection.
The System examined its host-memory-based embodiment, understanding why he'd loved this character so much.
[Can't see my toes... soft... smooth... no wonder the host adored this character. His room was filled with auspicious dragon posters and figurines—but also plastered with her posters and collectibles!] The System's internal commentary was dry before focusing on treatment.
[Initiating treatment! Target: Host—Kaido!]
The System raised both hands. A virtual screen materialized, displaying Kaido's physical status and comprehensive data.
[Detecting severe damage to host soul and body. Separation required for individual restoration!]
[Beginning soul-body separation... Separating... Success! Initiating restoration!]
A transparent soul emerged from the physical form, hovering alongside. The System began with soul restoration—blue light cascading over the fractured spirit.
The luminescence slowly mended each crack. The screen displayed [Restoration Progress: 10%].
[Restoration proceeding slowly. Consume stored Interdimensional Energy to accelerate? Consume?]
[YES/NO]
[YES!]
[Understood! Consuming 15% stored Interdimensional Energy. Accelerating soul restoration!]
[Current progress: 15%... 27%...]
[Estimated restoration time: 30 minutes!]
With the soul set to autonomous restoration, the System turned to the physical body.
[Ding! Detecting severe trauma to host body! Activate complete body reconstruction?]
[YES/NO]
The System hesitated here. Selecting [YES] meant simple restoration—Kaido would remain identical to his original form.
Selecting [NO] meant complete reconstruction. But should the reconstruction produce a girl? Or a girl? Perhaps a girl instead?
However, gazing at Kaido's features, the System decided maintaining his original appearance was best. After all, he'd made one promise to the System that remained unfulfilled.
[Sigh... Actually, keeping him male isn't so bad.]
[Selection: NO]
[Beginning body restoration. Consuming 20% stored Interdimensional Energy to accelerate!]
Golden light bathed Kaido's form. Every wound healed at visible speed.
[Current progress: 10%... 15%...]
[Estimated restoration time: 40 minutes!]
Task established, the System conjured a chair and sat down—gazing at Kaido's face with a subtle smile.
Then numerous outfits materialized. Maid uniforms. Shrine maiden robes. Kimonos. An entire wardrobe.
[Don't blame this System. You promised to wear any outfit I provided—as long as it didn't cross your boundaries!]
Before realizing it, the conjured clothing collection had grown exponentially. Finally, the System's attention fixed on one particular outfit—a shrine maiden ensemble with a kimono top and pleated miniskirt bottom.
[This one's perfect! Hehe...]
The System even auto-generated mental images of Kaido wearing it.
(Why are so many people grinning like they're playing cards with the sun and moon?? So many shocked reactions!)
━━━━━━━━
Three days had passed in the external world since everyone returned to Corps headquarters. Treatment and recovery were underway.
During this time, Tamayo, Yushiro, and Chachamaru had consumed the humanization drug. After one day, they'd finally shed their demonic nature.
Tamayo had initially planned to depart this world after Muzan's destruction. But Ruka Rengoku and Amane Ubuyashiki's counsel convinced her to release the past and embrace life anew.
This brought Yushiro profound joy. He remained deeply grateful for Kaido's help—though they'd never see him again...
After becoming human, both began researching medicines at the Butterfly Mansion—helping purge Muzan's residual toxins and treating everyone's injuries.
Chachamaru spent days basking in sunlight, frequently visiting Kaido's estate. Hoping to see that person...
After three days, the Hashira, Tanjiro's trio, Kanao, and Genya had their toxins mostly cleared.
Though physical wounds required months for complete recovery, this presented no real concern.
Muzan was destroyed. The world's final three demons had become human.
Peace had returned. No one would suffer demonic attacks again...
━━━━━━━━
Kaido's Estate.
Kuroha gazed at his exquisite wooden bowl in the courtyard—hand-carved by his master.
Seeing it always brought memories flooding back. Missions together. Beautiful moments at the estate.
After every mission, delicious food prepared especially for him. Treats and snacks shared generously...
But those meals would never come again. No more playing together. No more missions together...
Tears fell uncontrollably.
"Kuroha?"
Hearing his name, the crow thought his master had returned. But turning—it was Retsuki.
"Kuroha, are you thinking about Kaido-niisan too?" She extended her hand, stroking his head as Kaido once had.
Kuroha said nothing. Silent tears continued flowing.
"Kuroha, please eat properly. Otherwise, Kaido-niisan would be sad knowing you're like this..."
She emptied the bag's contents into his bowl—pet food Kaido had prepared for his crow.
But Kuroha didn't eat. He simply stared at the wooden bowl.
'Kuroha, if you don't eat and get skinny, you'll never find a female crow!'
His master's past words suddenly echoed through his mind. Gazing at the food again, he slowly began eating...
Seeing Kuroha finally eat brought Retsuki small relief. She departed the courtyard.
Ascending to the second floor, she opened Kaido's room. The vast estate now housed only herself and Kuroha. Emptiness consumed her heart...
These past days, she'd slept in Kaido's room. The lingering scent in his bedding brought comfort—as though her brother remained beside her...
Her gaze swept the room, settling on the desk. Several neatly arranged books—Kaido's journals. A photograph rested on the desk surface: her and Kaido together.
She remembered when her brother had produced a metal box-like device, explaining it was a camera—capable of capturing every smile, every moment of life.
He'd asked Kakushi members to photograph them together...
Sitting at the desk, she opened one volume: a photo album titled [Demon Slayer Corps Daily Life (1)].
Each page held four or five photographs documenting everyone's smiles (excluding that garbage Kaigaku).
The Rengoku family of four—beaming with warmth.
Kagaya's family of seven—radiating happiness.
The three Kocho sisters—like butterflies dancing on wind.
Aoi and the three youngest girls—resembling a kindergarten teacher playing with her students.
Tengen and his three wives—Tengen striking what he considered a flamboyant pose behind them, the image dripping with romantic excess.
Mitsuri kissing Obanai's cheek—his face bright red, both looking blissfully happy.
Gyomei, Muichiro, and Giyu together—the younger two making peace signs while Gyomei stood behind them with hands clasped, as though photographing a Buddha statue.
Sanemi and Genya with arms around each other's shoulders—smiles radiating sunshine.
Tanjiro's trio and Nezuko at night—their adorable expressions uniquely charming.
Nearly every Corps member was documented in this album. Each page turn revealed several people or individual portraits.
Every face wore bright smiles.
But reaching the final page, seeing the inscription in the bottom right corner—Retsuki couldn't contain her tears any longer.
[With my life, I trade for your remaining years.]
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