Demon Slayer: I Train the Demon Slayer Corps into an Immortal Sect

A Demon Slayer fanfic with a "teach the way, earn cultivation in return" system.

It turns out Muzan is not the progenitor of demons. He is merely a drop of blood from the Blood Moon Tai Sui of distant eastern legend.

Lu Xuan transmigrates to the Taisho era of Demon Slayer and takes the alias Asakura Genichi.

On the night of the Final Selection, just as Sabito is about to die beneath the Hand Demon's fists, the "Kindling Dao Scroll" unfurls in his sea of consciousness: teach someone a cultivation technique, and you will receive cultivation in return. The stronger the recipient, the greater the reward.

And so Sabito forges a furnace of blood and qi, then personally beheads the Hand Demon; Giyu Tomioka opens his Radiant Meridian, turning Water Breathing into a raging torrent; Kyojuro Rengoku kindles the fire in his heart, ensuring the flames aboard the Mugen Train never go out.

While the Hashira are still risking their lives to train, Asakura Genichi has already begun teaching the way. While Muzan plots to destroy the Demon Slayer Corps, the swordsmen who once had to trade their lives for victory have been trained by him into the greatest immortal sect for slaying demons in the human world.

But when Muzan's head hits the ground, the Kindling Dao Scroll reveals a line of bloody text:

[The source blood remains. Demons will never vanish from this world.]

Muzan is dead, but the night has not ended.

Asakura Genichi raises his Nichirin Blade and follows Muzan's bloodline ever upward.

This time, he will cut down the living moon at the very end of that bloodline.