One Piece: The All-Purpose Breathing Technique

What would happen if someone brought the Breathing Style from Demon Slayer to the world of One Piece?

"A flaming slash! Is he a Devil Fruit user?"

"His sword moves like flowing water. I've never seen techniques like those!"

"His strikes are impossibly fast. How terrifying! You can't even sense them!"

What kind of turmoil will Ajie, who also bears the initial D, stir up in the world of One Piece?

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