Almighty Breathing Method of One Piece

What will happen when you come to the world of pirates with the breathing method in Demon Slayer: "Burning slash! Is he a Devil Fruit user?" "His sword becomes like water, a move I have never seen before!" "His sword moves are incredibly fast, so scary! You can't even notice it!"... Agel, who also carries D, will cause a disturbance in the world of pirates. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.