I Took a Life-Draining Skill into Demon Slayer, and From the Start I Went After Muzan

Shen Yan is the Demon-Slaying Heavenly Emperor who activated the Longevity System. He can use up his lifespan to power up.

He wakes up to find he's become Kamado Tanjiro from Demon Slayer!

Only 13 years left to live from the start? He immediately burns 10 years to unlock the "Milky-Sweet Blade"!

Slay demons and drink their blood to gain lifespan, teach the Hashira to awaken their marks, and watch the plot fall apart even worse than Enmu's dream.

"Original-story fans, don't panic. I'm just turning this tragic ending into a lifespan-burning power fantasy!"

Tease the Spider Sister on Mount Natagumo, burn lifespan to slay an Upper Rank on the Mugen Train, double-kill in the Entertainment District, and even teach the Sound Hashira how to date...

Muzan: Why does this Tanjiro land critical hits with every strike and have a revive token?

Shen Yan: I'll burn through 999 years of lifespan in one strike. I only need a second to solo you.

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.