TBATE | Upper-Rank One's Reincarnation.

Chapter One | The Moon, Born Anew

Kokushibo had always been a reserved, silent, and stoic individual. As the Upper-Rank One, he maintained an aura of tranquility and mystery. A man that even Muzan Kibutsuji considered a 'business partner' despite his outward display of reservation, dignity, and humility, there exists a cold and unforgiving side. 

When reprimanding individuals, his words can be harsh, bordering on cruelty. His threats are severe and demand absolute obedience. However, beneath that powerful yet lonely upper demon lies a very complex past as a human.

A teenage Kokushibo, or Michikatsu, was consumed by jealousy and envy as the one the gods blessed was his younger brother.

The Gods blessed Yoriichi with natural talents that no one ever surpassed in the entire era of Demon Slayers.

Having read their mother's diary, Michikatsu discovered that his younger brother, Yoriichi, was not clinging to his mother but was supporting her, having known about how her illness weakened her.

The realization infuriates Michikatsu, a deep hatred and jealousy towards his talented younger brother taking root within him, to the point where he wishes Yoriichi had never been born and mentally begged for him to die.

The rest is history.

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The conflict resulted in Kokushibo being reduced to ashes, and the demon experienced a sense of drowning in an ocean.

The peacefulness of the situation was unsettlingly quiet, but he did not voice any objections.

Kokushibo's six eyes slowly opened, and he muttered, "Calm." He descended into a serene ocean, his vision becoming darker as he plunged into the depths of the shadows.

He felt his body convulse like falling into a deep, eternal sleep.

Or so he thought...

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Kokushibo strived to open his eyes but was unsuccessful in doing so. He hoped to see what occurred after his vision grew dark.

Suddenly, an unfamiliar voice emerged from the background. "Congratulations, Sir and Madam. Your sons are healthy!" the voice declared, its tone soft yet masculine.

Kokushibo wondered where he was and attempted to open his eyes, but he could only listen. Despite being a baby, Kokushibo somehow understood the foreign language -- No, this world was foreign to him.

(Kokushibo's POV)

Over time, I realized that I was born into a new world, which was unfamiliar to me. As I paid closer attention to my family, I began to recall my past life as a human, which made me feel nauseated. The thought of my former human self disgusted me, and the truth of my past became more apparent as I recalled more memories.

The woman, Alice Leywin, was the name of my new mother of this world. She resembled another remnant of my past, a kind-hearted woman. The father, Reynolds Leywin, on the other hand, was a complete moron yet a dependable and charismatic man if you ignored his frequent childishness, which was odd, but refreshing.

Despite my aversion to my past, I chose to learn about this new world and its fundamental principles along with my twin brother, Arthur Leywin. Additionally, I discovered that my name was either Alexander Leywin or Alex Leywin.

However, I wondered if my old powers were still intact. This world was distinct from my previous one. The entire week felt like a torment to me, as I, the Upper-Rank Demon, had been transformed into a human child once more. The inability to control my bodily functions, which accompanied this weak physical form, was a source of great frustration for me.

There was a remarkable spectacle to witness. My mother healed Arthur, but how? Does Blood Demon Arts also exist in this world? It was strange, as I had always believed that only powerful demons could attain the Blood Demon Arts

After observing my surroundings for a considerable amount of time, it was evident that this world was not like the Edo Period, as it had already incorporated some modern equipment. It seemed that this world was indeed not modern, but rather from the Middle Ages, as I presumed.

While visiting places outside my home with my mother, I realized that this world was indeed foreign, with humans walking around with armor and weapons. My brother, Arthur, remained curious about this world, it reminded me of Yoriichi. The thought of Yoriichi makes me sick, it was also a coincidence that I was born in this world with a twin brother.

I discovered that the world draws its power from Mana and uses Magic. Notably, in my previous existence, I was not familiar with Magic.

Humans were once helpless against demons, but they created the Slayer Corps to combat them using Breathing Techniques, which my brother Yoriichi invented. Yoriichi's exceptional abilities and talents made me feel inferior. 

While partaking in a family dinner as a child, a sense of nostalgia suddenly arose within me, evoking feelings of novelty and a sense of unfamiliarity. Growing up in a samurai household during the Sengoku Period was a common occurrence, but the experience now seemed revitalized and unfamiliar to me. It was as if I possessed no understanding of the world.

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Hey guys. Sorry for not writing. It has been a while since I wrote a story and decided to write one about Kokushibo in TBATE. Do notice that my writing skills are now bad and I'm planning to polish them.

Forgive my English, it's not my first language. I'll see y'all later.