One year. Exactly one year since the death of a Mother. The Kurosaki family, engulfed in grief, stayed out longer then they should have, encountering a demon on the walk home. Good thing a Demon Slayer was around to save them. Inspired by The Butterfly(Kurosaki) effect. Rated T for now, may become M as story matures.

When the Demon Slayers in the Hero Alliance journey to Tanjiro's world to have a new sword forged for him along with repairing David's Masakado. They encounter a variety of people such as the Mist and Love Hashiras and the Wind Hashira's younger brother along with someone the Hero Alliance fought back then that was supposed to be dead.

Tanjiro, on the brink of death, is unexpectedly rescued by a mysterious entity that entrusts him with a new mission in a different realm. However, when attempting to return home, he becomes entangled in complex political intrigues and is forced to confront an imminent threat looming over the seven kingdoms. Additionally, his own morality will be put to the test.

He was never a part of this world but lost on choices he had to stay and slay in order to make this world worthy to remain alive and look forward to another day. But who thought his leisure plans would be interrupted by a certain butterfly?

Naraku and Muzan were one in the same. The same being, just different faces and names. Centuries after she was sealed within the jewel, awaiting his resurgence, Kagome wakes from her slumber. All she once knew is no more, yet she finds a new place among the Hashira. Yoriichi's memories are cradled close to her heart, and she finds a reminder of him in Tanjiro/ Redone

Muzan survives the Sunrise Countdown Arc. Consequences arise when the Anomaly that is the Demon King continues on living... though some of them are well beyond his Control. [Cross-Posted on Ao3]

Kurosaki Masaki's mother came from the Kochō family, a slightly recent but no less skilled family in the Demon Slaying World, and Ichigo imitates and changes himself to be more like his mother after she died, but still every bit of a protector as he always is. This changes things... obviously. As always, it's the butterfly (Kurosaki) effect.

Kokushibo wakes up after death in a strange dungeon with no idea how he got here, which is even stranger... He was no longer a demon. will our new hero be able to adapt to the new world? Will he be able to start his life over again?

When Marin moves in next door to the Shabana siblings, at first they seemed destined to be enemies. Afterall, the Shabanas were rude, crude and insufferably jealous of anyone who did anything better than them. Everybody hated them so why bother getting close at all? Yet here she was adopting them like strays behind a dumpster.

Kimetsu Academy received an invitation from one of the most elite school in Japan to join the inter-school festival there, and the invitation has something to do with a certain teacher and his not-so-really-good 'science project'. And Uzui-sensei is up to do something crazy again. Based on Kimetsu Gakuen AU with OHSHC Post-canon.

A story of how one man, Yoriichi Tsugikuni, was able to turn the famous Yojutsu in The Land Of The Sun into Breathing for many users.

When faced with a near-impossible threat, It falls upon the most unlikely of heroes to rise up and face it. Bound with nothing but the knowledge of the future, Josuke is thrown into a time that not many can recall; forced to face an age-old enemy in the hopes to save the future from its hidden past.(Check back every week for new chapters!)

Threat to Humanity detected. Counter Force Intervention now implementing– failed. Spiritron Stability impossible. Servant Summoning impossible. Searching for viable vessel alternatives– found. Newly augmented Spirit Origin established. Counter Guardian EMIYA summoned. Class BERSERKER. Mission Objective: Slay all the Demons!

A Crossover story Challenge between Twilight Princess & Demon Slayer for anyone that want's it. Featuring Link after saving Hyrule being put into the events of Demon Slayer.

She was once a holy woman, who vanished the cursed jewel that cost a lot of lives. However, she was brought to sleep and was sealed for years due to her regrets. Now, she was awaken, was being called upon by the gods and was summoned to another time.

Muzan Kibutsuji was dead- dying at the hands of The Demon Slayers after warring with them for over 1000 Years. When he died, he knew full well that he was never going to reincarnate... or so he believed! After an untold amount of time in the void, a strange voice gave him a choice, remain in the void for the rest of time? Or... become reborn. He chose the latter.

“Listen, Tanjiro… what I’m about to tell you was a story passed down from our ancestors,” bright dark red eyes look at his grandma, eager to listen “What is it, grandma?”. His grandma who looked at him, smiled softly at his adorable expression, “it’s about a girl who overcame time…”

Michikatsu Tsugikuni And Yoriichi Tsugikuni Are Given A Second Chance And Are Reborn In The Future As Kouichi Kimura And Kouji Minamoto A Story About Brotherhood That Transcends Life Times

Yoriichi is confused. He remembers vividly of the day his heart stopped, the day he stopped breathing. But if he did, then why can he feel blood sluggishly running through his veins, lungs expanding and constructing in the way he has done all his life, a pulse that is barley notable but still ever present?

Eri prays for a new life far away, and her pleading is answered, suddenly surrounded by people who need hugs. Kokushibo and Nakime are now parents, Akaza, Doma, and Muzan are uncles, Daki is an aunt, the other two are the odd cousins, and none of them have the slightest clue why she has a horn and where she got powers.

A mirror can lead you to a new world. Some who possess the power to grant others to go through other worlds thanks to mirrors is a power that can be scary. Another form of chaos arrives at Bayville, in the dark of the night, so powerful that can be trouble even for the X-Men. Rated M for Harem, language, and Gore.

In his final battle, Yoriichi succumbs to old age, having failed to accomplish what he believed to be born to do, leaving his world as a man of no worth. Now in the other-realm, he is given the choice to pass onto the afterlife or be sent to a new world of monsters and magic to defeat a Demon King. Transported to this new world, follow his journey in this wonderful world!

There's another kid who sailed on the Oro Jackson aside for Shanks and Buggy. Fem!Zenitsu in OP an AU for my existing story

A series of memories. Shinobu attempts to connect with a new addition to her home thanks to her sister.

Things are not exactly what they seem at first glance. This is the mistake that most people make when they encounter the unexpected. It's the same mistake that will lead a love story to blossom, even in the darkest of times you can find a little bit of happiness, like a golden lotus in a frozen lake.