Love & Blood

Prologue - - The Demon Queen

Few speak of Muzan Kibutsuji, the Demon King, without fear. To demons, he is the absolute ruler, the progenitor of their kind. To Demon Slayers, he is the ultimate evil, the enemy who must be destroyed. But to most humans, he is a shadowy myth—a nightmare they are fortunate to never encounter.

Legends often paint him as a solitary figure, cruel and unyielding, standing atop a mountain of corpses without allies, without a family. But the truth, buried beneath centuries of blood and darkness, is far more complicated.

Muzan Kibutsuji did not always reign alone. Once, he had a queen by his side—a woman who loved him before the monster was born. And together, they had a child. This is my story, the forgotten tale of Y/N Kibutsuji, Demon Queen and wife to the man who became the first demon.

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Long ago, Muzan Kibutsuji was not the fearsome creature of the night that he is today. He was a man—a frail, sickly heir to the wealthy Kibutsuji family, cursed with an illness that threatened to claim his life before he reached his prime. His family, desperate to secure their legacy, arranged for him to marry five wives. Among them was me, a sixteen-year-old girl offered as part of a deal between my struggling family and the powerful Kibutsuji clan.

I was his fifth wife, the youngest and least experienced. The other wives saw me as nothing more than a servant, leaving me with the chores they refused to do. They mocked me, treating me as if I were beneath them. But I didn't mind. My duties kept me close to Muzan, and the more time I spent by his bedside, the more I came to know him.

Muzan, despite his illness, was kind to me. He would thank me for the care I gave him, and in those moments, I saw a gentle soul yearning to escape the shadow of death. It wasn't long before I fell in love with him—not the wealth or status, but the man himself. I vowed to be the wife who stayed by his side, in sickness and in health.

As the months passed, I became his favorite. Muzan grew distant from his other wives, disgusted by their apathy and selfishness. They saw his illness as a nuisance, but I saw it as a challenge—a reason to love him even more fiercely. Our bond deepened, and soon, I carried his child.

But with my growing belly came a growing fear. Muzan's health deteriorated rapidly, his body weakening as the illness consumed him. Despite his brave face and reassuring words, I could see his frustration. He hated his helplessness. He hated that he might not live to see his child born.

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In his desperation, Muzan turned to the family doctor, who had been tirelessly working on a cure. The treatment involved a rare plant called the blue spider lily. Muzan and I both consumed the concoction as part of the regimen, though its effects were unclear. When our daughter, Kimiko, was born healthy and strong, I dared to hope that fate might smile upon us after all.

But the cure was incomplete. Muzan's impatience drove him to kill the doctor before the treatment could be perfected. That decision changed everything. The medicine did save Muzan, but not in the way we had hoped. It transformed him into a demon—a creature of immense power but cursed with an insatiable hunger for human flesh and an inability to walk in the sun.

I will never forget the night he truly became a demon. I was in the nursery, rocking Kimiko to sleep, when I heard a scream. I ran into the halls, clutching my child, only to find the lifeless bodies of our servants strewn about. Blood painted the walls. At the end of the corridor stood a figure, familiar yet unrecognizable.

"Muzan?" I whispered.

He turned to face me, his once-gentle eyes now glowing a menacing red. His pale face was smeared with blood, and sharp fangs glinted in the dim light.

I took a step back, terror coursing through me. "D-don't come any closer!"

His expression shifted, shock and pain replacing the cold detachment. "Y/N, it's me," he said softly, taking a step forward. "I'm not sick anymore. I'm better. I'm strong now."

But this wasn't the man I loved. This was a monster. Clutching Kimiko tightly, I turned and ran. His voice called after me, pleading for me to stop, but I couldn't. The man I loved was gone, replaced by something dark and terrifying.

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Two years passed before I met Muzan again. By then, I had learned the truth about his transformation. He had become the first demon, capable of creating others like him. His other wives, tormented by their guilt or by Muzan himself, had taken their own lives. Only I remained.

When Muzan offered to make me a demon so that we could live together forever, I agreed—not out of love, but out of fear for my daughter's safety. Becoming a demon was a nightmare. The hunger was overwhelming, and I struggled to control my instincts. But I clung to my humanity, refusing to take innocent lives. Instead, I survived on animal blood, much to Muzan's disdain.

Our daughter, Kimiko, was turned into a demon when she turned fifteen. Together, we formed a fractured family, ruling the night as Muzan sought a way to walk in the sun. He became obsessed with power, creating an army of demons and experimenting on them to achieve his goals.

Despite the darkness that consumed him, I saw glimpses of the man I once loved. He cared for me and Kimiko in his own way, though his ambition always came first. I hoped that, one day, he might remember the life we once shared.

But fate had other plans. A man rose to challenge Muzan's reign, a warrior whose strength and resolve would give birth to the Demon Slayer Corps. And with them came the slaughter of demons, one after another, until even the Demon King himself began to fear for his life.

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This is my story, the tale of a queen who loved a man before he became a monster. A story of love, loss, and the shadows that haunt the night.

My name is Y/N Kibutsuji, and I was once the Demon Queen.