From the Start in Demon Slayer, I Wield Sun Breathing

Transmigrating into Demon Slayer, he binds himself to an Infinite Evolution System.

Kill an enemy and he can copy one of their abilities.

Sun Breathing to slay demons, the Mangekyo to break curses, Conqueror's Haki to subdue pirates, Kyoka Suigetsu to shatter the Soul Society, Super Saiyan Blue and Ultra Instinct to sweep through Dragon Ball, the Limiter released to crush One-Punch Man...

From Sun Breathing to the ultimate power across all worlds, I will use the strength of every world to suppress everything!

You ask why I'm so strong?

Because every enemy I kill gives me another ability.

And I've already killed a lot of them.

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.