Beginning Of The End: After The End - Demon Slayer: Kimetsu no Yabia (On Break)

Prologue

Author's Note: Before we get to the actual storyline of Kimetsu no Yabia, Libby does encounter Tomioka-chan, Okayata-sama, Muichiro and Yuichiro before the actual story starts, she does change the minds of Tomioka-chan and the Tokito brothers alongside with Okayata-sama, but for the other Hashira, like Rengoku, Shinobu, Obanai, Mitsuri, Tengen, Sanemi and Gyomei might take a little bit more convincing to say that she would not eat any humans, and Tomioka-chan might be a bit OOC, along with the other Hashira that might act like their characters or be a bit OOC as well, then Tomioka-chan will go back to being a stoic Sesshomaru, and the other Hashira can go back to being themselves when the actual storyline starts, otherwise please enjoy the Prologue of how the Inutachi Healer Clan became apart of the Demon Slayer Corps.
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How...?

How did it come to this...?

But before that question can even be answered, let's follow the story of the Doctor, Libby Healer and Nori Kakyoin, and how they even got this far into this bizarre story called "life". In their original timeline, 'Beginning Of The End', Libby was eighteen when the Doctor regenerated into a woman, and the Healer trio met a lot of humans named Graham O'Brien, Ryan Sinclair, Yasmin Khan, Dan Lewis, Jean Pierre Polnareff, Jotaro Kujo, Rohan and Lillian Kishibe in their five year relationship. The Healer trio faced new aliens and return faces, the new aliens like Tim Shaw, the Remnants, Krasko, Mutant Spiders, Thijarians, DeliveryBots, Morax, Solitract, Dregs, Skithra, Praxeus, Zellin and Rakaya, Ashad, Swarm, Azure, Molly Polnareff, Prentis, Yashahime Kira, Bel, Geimma Giovanna, Vinder, Jasmine Kujo and the Sea Devils. The old faces are the Master and Elizabeth Healer, the Daleks and their hybrid, Penelope Fugo, the Judoon and their hybrid, Brittani Bucciarati, the Cybermen and their hybrid, Gelda Mista, the Weeping Angels and their hybrid, Karyin Hirose, the Sontarans and their hybrid, Molly Avdol, the Ood and their hybrid, Leyia Abbachio. The Healer trio, along with their humans faced them all within the five years they have met the humans, with their remaining years that they had left, until the Master and Elizabeth taken their lives from them and they regenerated peacefully at Durdle Door, but their adventures are far from over, and it sparked them to have their own adventures in the world of ANIME!!

The Healer trio regenerated into the world of 'Sword Art Online', and the trio alongside Shigeo Kageyama otherwise known as Mob alongside with Kazuto Kirigaya known as Kirito are in a fight for their lives along with the ten thousand people who were playing the game that can't escape, which turned into a death game where over four thousand players lost their lives to this death game, Libby joined the most sickening Guild in the whole game, Laughing Coffin. She only joined that guild to kill their own members and save her friends and family, and that is where the name "Killing Perfectionist" came from. Things kinda spiralled from there, Kirito, Mob and the Doctor went on another adventure to save their girls, Asuna and Tsubomi from a perverted entrepreneur who kidnapped three hundred players, the Lightning Flash and the Bringer of Light amongst them, and the trio encountered Leafa, otherwise known as Suguha Kirigaya, she helped them get to the World Tree, and foil Nobuyuki Sugo's plan, and free the remaining players that were trapped against their will.

Next, the trio went into the world of Guns, and met Sinon otherwise known as Shino Asada, she played GGO as therapy to not be reminded of her past that she shot a bank robber in broad daylight, and with Death Gun in the picture, known as Red-Eyed XaXa in SAO in IRL, he's known as Shoichi Shinkawa, and his little brother as his accomplice to do his older brother's dirty work, and he's known as Kyoji Shinkawa, and he had a thing for Shino, but when he spiralled when the trio figured out who Death Gun is, by the help of Libby Healer, killed him and they won BoB, but they had to leave the game to save Shino, and take down the little brother. It has been quite the four year adventure, and the trio are in the Underworld because of the former member of Laughing Coffin came and gave them a shot that nearly killed them, but they spend two years - Underworld time - a day at least in IRL, and when they face Quinella and Gabriel Miller, they had to kill them, and save Alice, Ritsu, Naitsukyi and Eugeo to make it back to the other side for a new adventure to begin on the other side of a virtual world.