Solo una idea de Archer en el mundo de Kimetsu.

Shirou Emiya, the person who arguably got isekaied the most in Type Moon's history. Isekai sounds fun right? Meet new people and get awesome power. An never ending adventure for our Hero of Justice. But what if, instead of just Shirou Emiya, everyone got isekaied. How will the world react if instead of getting hit by a wrench, the world got hit by an entire toolbox.

(One shot) Having travelled through time and space, a man turned boy travels the world during a time of demons, where an organization exists to eliminate said demons. He is one with experience, knowledge, and morals that can change the world of these demons and slayers. Ships if this is continued: (OCxHarem) (TanjirouxKanao)

When Kotomine Kirei was put under the tutelage of Tohsaka Tokiomi for the upcoming Holy Grail War, his eyes caught the attention of Tohsaka household's silent housekeeper, Tsuyuri Kanao. [Character Analysis/Study Fic]

No one knew how or why it was happening, but for some reason various Servant's of Japanese origin have begun to appear throughout the land. From historical figures, to demon slayers, and even demons themselves, there seems to be no pattern to their arrival. All that is known for certain is that when they encounter someone, it will be quite the interesting experience.

Years after the 5th Holy Grail War, Shirou, Rin, and Saber had all been working on their strengths and weaknesses with one another, comforting in the bond that they share with each other. On one dead apostle hunt, they bite off more than they can chew when confronted with an elite apostle. In order to save Shirou from Alaya, Rin must make a decision, whether it be good or bad.

The appearance of one person can offset an entire timeline. Changes, turns, twists. When that person doesn't exist in history, there's nothing that fate can do to try and 'right' what they have 'wronged' except to just let it happen. This is how timelines change and altered universes are created... Better known as: Musashi messes another timeline up, but in a fantastic way.

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!

In which Kamado Tanjirou was summoned as Saber in the Fifth Holy Grail War, and single-handedly ended the War by being a nice person and a really good big brother.

Saving lives always becomes her passion. It will not change in this lifetime. Nothing will stop her from reaching her dream, not even an Upper Moon demon can stop her. Or in which Florence Nightingale ride the Infinity Train and encounter a certain Pillar and certain Kamaboko group. Two Shots. Pairing: Possible RengokuxNightingale.

A cry for a savior, a wish to survive. That was all it took for Shirou Emiya to appear. A hero is wished into a world before his time to fight against the demons of humanity. Rise Hero, for the sake of others falls upon your shoulders. {One-Shot} Spoiler Alert! This covers the Dimensional Infinity Fortress Arc. (Note: Thanks to The Indominator for pointing it out.)