[Genius, mortal.
A dimensionality-reduction-like comparison dragged Kokushibo into the abyss.
Hatred, disgust, fear —
He was clearly a person standing at the pinnacle, but the fire of jealousy burned him to ashes.
But Yoriichi knew nothing of this; he was kind enough to accept such a wandering 'sacrifice'.
As a 'forbidden child', his mother and brother were the bridges that connected him to love.
The family's confinement prevented him from experiencing the turbid world, and also allowed the genius's heart to remain pure and calm.
When he stepped out of the house, there was no fear or panic in Yoriichi's heart.
Under the night sky, he wandered alone.
Stars were scattered, the world was brilliant.
Yoriichi's speed grew faster and faster, faster and faster; he galloped under this boundless starry sky —
The natural wind, the path forward, a heart no longer restrained!
That brilliant 'divinity' merged with nature, his dark eyes grew brighter, shining resplendently!
He was like a kite no longer held in his mother's hand, soaring freely, breaking free from the last thread of attachment!
Until the sun rose and set, darkness dispersed, exhausted, Yoriichi never stopped!]
[ Kakeru Kurahara: "If you feel pain and fatigue, then run! Let the natural wind cleanse your soul!" ]
[ Eren: "...In that instant, I seemed to see Yoriichi like a bird, breaking free from its shackles, soaring in the sky." ]
[ Merlin: "Most humans are like fallen leaves, floating, tumbling, trembling in the air, eventually falling helplessly to the ground. But a few are like stars moving in a predetermined orbit; the erratic winds of fate cannot reach them, for their hearts have a predetermined course."]
[ Might Guy: "That's right! Young man! Run! Burn! This is youth! Wuwuwu!" ]
[ Shirai Kuroko: "Hey, hey, hey! Old man, are you some kind of chuunibyo? How can you make yourself cry!" ]
[ Koyuki: "Mr. Yoriichi is truly a gentle person; he will surely be happy in the future."]
[ Douma: "Koyuki... who are you?" ]
[For one day and one night, the young Yoriichi ran for an entire day and night, and at dawn, he reached the end of the fields.
There, he met a small, lonely girl his age.
But what surprised Yoriichi was that the girl just stood there motionless.
Yoriichi proactively asked why and learned that a plague had killed her family, and she was very lonely and wanted to catch some tadpoles to take back.
The dazed Yoriichi looked at the sad, lonely girl and blurted out, "Then I'll go home with you."
The girl's hand paused, and she turned her head blankly; tears had already welled up in her eyes at some point.
A faint clear light emanated from her obsidian-like eyes, reflecting the equally small boy.
In an instant, the girl's heart was filled with something.
Under the setting sun, the girl wiped away her tears and took Yoriichi home; the young girl talked incessantly, and Yoriichi listened quietly without any impatience.
Day and night, spring and winter, year after year, the two lived together, deeply in love.
Until they became husband and wife, as time passed, Yoriichi finally understood the immense difference between the world he saw and the world others perceived.
This was... the origin of the 'sense of alienation'.
There was no one else like him in the world.
Whenever Yoriichi spaced out, the girl would just tightly grasp Yoriichi's hand, smiling and integrating into this ordinary yet warm world.
The young girl tightly held the kite with the broken string.]
[ Eriri: "Wuwuwu! This is the real script! So sweet! The girl is the best! Childhood friends are the best!!! All those sudden arrivals can get out of here!" ]
[ Kasumigaoka Utaha: "Isn't Mr. Yoriichi also a sudden arrival for the girl? What is that golden-haired dog barking about?" ]
[ Kurosaki Ichigo: "Ah, Mr. Yoriichi is so gentle; he must be very happy."]
[ Satania: "Woohoo~ This Great Demon King of Hell approves of you two humans; live happily ever after!" ]
[ Zoro: "It's a pity such great talent, yet he never practiced swordsmanship?" ]
[ Goetia: "There will be a chance."]
[ Fujimaru Ritsuka: "...Eh?" ]
[ Merlin: "Ritsuka~ Don't you know that everything you gain and experience, destiny has already marked a price for it?" ]
Demon Slayer World
Infinity Castle
A Lower Rank Demon with a hideous, greenish-red face showed a thoughtful expression; that... woman, had he seen her before?
["Yoriichi, be careful~" The girl, with a swollen belly, waved goodbye.
"Mm," Yoriichi nodded. The girl was close to giving birth, and he needed to find a midwife.
Yoriichi was very fast, reaching a secluded path in less than half a day.
But just as Yoriichi was about to leave, a shout made him stop. It was an injured old man.
The kind Yoriichi took him to his three sons, three mountains away, and by the time he returned, it was almost deep night.
But Yoriichi was not anxious, because, having been able to discern his mother's hidden illness, he could accurately predict the exact time of his wife's labor with a glance.
It wouldn't be too late to find a midwife the second day.
The silver moon hung high in the sky, slowly being obscured by dark clouds... When Yoriichi returned home and pushed open the door, dazzling blood slowly flowed to the entrance.
His wife and child had both tragically died... Even the things he valued more than life itself could be so easily trampled upon...?
Yoriichi did not cry, and no light could be seen in his eyes.
He just staggered to the girl's side, holding her corpse tightly for ten days and ten nights.
His wish was to live peacefully with his family, to be able to look up and see the face of his loved one, and to reach out and touch their warmth.
Just... just that would have been enough.
But even that wish was easily shattered by the demon's attack.
Should he hate? Should he rage? Should he weep?
Nothing could change; everything lost vanished like smoke, leaving only loneliness and sorrow forever lingering in Yoriichi's heart.
It wasn't until a swordsman from the rengoku family, tracking the demon's traces, persuaded him that Yoriichi finally buried the remains of his family.
Yoriichi stood up, his gaze blank yet resolute, looking into the distance.
After that, he would fight to eradicate the purely evil existence of demons, and for this beautiful world!
However, the kite tightly held in his hand, its string broke once more...]
[Orochimaru: "Even gods face many hardships."]
[Izumi Sagiri: "...Wait, are you kidding? How could such a wonderful older sister..."]
[Gabriel: "Hmph, some disgusting things really shouldn't exist in this world."]
[Tsunade: "Fickle fate, how tragic."]
[Orochimaru: "Human life is truly too fragile."]
[Kirishima Touka: "Man-eating... monsters."]
[Escanor: "Demons lurking in the darkness! They should be made to see the sun in the night!"]
[Meruem: "It's just the natural law of life; who dies by whose hand, no one can blame. If you have the strength, retaliate."]
[Kamado Tanjiro: "Ahhhhh! Damn demons! I will kill every single one of you! Not one will be left!"]
[Kibutsuji Muzan: "Damn demons!!!"]
[Sakata Gintoki: "...? Why is he playing the thief crying 'stop thief'?"]