[Book 1 A Flaw in the Blade] Two girls. A sprawling metropolis. And a haunting sense of déjà vu shared by both. Yukiko is a woman of precision: she keeps everything under control, from the exact measurements for her perfect mousses to the pristine order of her bakery and the composure of her own emotions. Shinobu has learned to hide her fragility behind a playful smile and the crisp white coat of a doctor. They are absolute opposites. One wraps herself in heavy coats, standing like an unassailable fortress; the other flits through hospital corridors in silk blouses, leaving behind a delicate trail of wisteria. But their souls possess a long memory. The moment they meet, an invisible thread pulled taut between them vibrates to the limit. Why does the stoic Yukiko feel such desperate nerves before their first date? And why does Shinobu feel truly safe only when Yukiko stands at her back? It is a slow, cautious drawing-together-where every accidental brush of their hands and every shared cup of tea heals, step by step, the wounds they don't even know they carry. //I do not own the world of Kimetsu No Yaiba, the rightful owner is Koyoharu Gotouge. This is fanfic, and the only characters I made are the ones introduced in the "OC" chapter//.

In the shadow of weeping willows and marsh-lights, a Breathing style was born that knew no fury. Reptile Breathing is the art of waiting, adaptation, and the cold-blooded strike. Its practitioner, Midori Habu, became a Hashira while being more of a ghost than a warrior. Her world, built on logic and survival, was shaken by a single smile. Kanae Kocho, the Flower Hashira, became the warmth Midori had never known and so desperately needed. But when Upper Moon Two extinguishes that light, Midori's world does not explode-it freezes. This is a tale of quiet love and even quieter grief; of how the Reptile Hashira retreated into the shadows to help her beloved's sister prepare poisons. She will not interfere in the fate of the main protagonists, but her invisible presence and a final Eleventh Form, forged from pure devotion, will alter the course of the final battle. English isn't my first language, so I apologize for any spelling mistakes or bad/wrong wording in my fics. //I do not own the world of Kimetsu No Yaiba, the rightful owner is Koyoharu Gotouge. This is fanfic, and the only characters I made are the ones introduced in the "OC" chapter//.

[Book 2 Gold in the Flaws] Her name is Yukiko Tsukikage, but within the Demon Slayer Corps, she is known only as the Shadow Hashira. With hair the color of moon ashes and cold violet eyes, she is a living contradiction: a phantom of light waging war in the darkness. Her blade, which absorbs light, moves with impeccable precision, and her Breath of Shadow - a unique and deadly art-is unparalleled. To all, she is the perfect blade, honed by tragedy, devoid of emotion and flaw. But that is a lie. "The Flaw in the Blade" is the story of the last of her line, who fights not so much with the monsters outside, but with the legacy and feelings inside. Can she accept the part of herself she swore to destroy, or will her desperate pursuit of perfection lead her to self-destruction? And what if this hateful flaw in her soul is not a weakness, but the only thing that can still save her? //I do not own the world of Kimetsu No Yaiba, the rightful owner is Koyoharu Gotouge. This is fanfic, and the only characters I made are the ones introduced in the "OC" chapter//.

This is the story of a girl born in the mountains and raised by the wind, whose path leads from the icy solitude of vengeance to the searing warmth of comradeship and self-sacrifice. Ayaka Yamadori's life began in an idyll-a small house in the mountains, among a family of herbalists who taught her the language of plants and silence. But this world was shattered when she was just five years old. A Demon, obsessed with finding the mythical "Moon Root," broke into their home and murdered her parents. Ayaka herself survived by hiding in the cellar, listening as her world died. The horror left one silvery-white streak in her dark hair. The next morning, orphaned and desolate, she was found by a retired Demon Slayer, the stern recluse Saitō-san. For the next ten years, her home was a cold cave, and her family was her silent mentor. Saitō turned her life into continuous training, forging a deadly weapon from her grief and will. She grew up believing a simple truth: the world is divided into hunters and prey, and emotions are an unforgivable luxury that leads to death. At fifteen, after passing her master's final test, she descended the mountain to become a full-fledged Demon Slayer. //I do not own the world of Kimetsu No Yaiba, the rightful owner is Koyoharu Gotouge. This is fanfic, and the only characters I made are the ones introduced in the "OC" chapter//.

Kirine Kage was born with a gift that became her curse. Her eyes are the color of silvery ice, and her body is sculpted for absolute silence. She is a child of a clan that has guarded the greatest secret for centuries: the location where the legendary Blue Spider Lily blooms. From childhood, Kirine learned not only the art of the hunt but also how to listen to her mother's silent lullaby-a map that reveals the path to this sacred flower. Her companion, the loyal wolf Gin, is her second soul, her second shadow. But when Kyōzo, the Fourth Upper Rank Demon, finds her village, this world of silence crumbles. Kirine's parents perish, and the secret they so fiercely protected falls onto her young shoulders. Now, Kirine is the last trace of her clan, a hunter whose only weapon is the Breath of the Phantom Predator and her faithful wolf. She steps into a world full of noise, pain, and betrayal to fight not only the demons but also the ghosts of her past. Her path is a road to the heart of the war, where she faces encounters with the legendary Pillars, brutal battles against the Upper Ranks, and finally, the ultimate hunt for the demon who destroyed her world. This is a story of strength born from silence, of loyalty forged in blood, and of a girl who must become the most lethal predator to protect her world. //I do not own the world of Kimetsu No Yaiba, the rightful owner is Koyoharu Gotouge. This is fanfic, and the only characters I made are the ones introduced in the "OC" chapter//.