The Promoter of the World Starting from Demon Slayer

Ghost! Not scary at all! And it's kind of charming! Ghost! The material that makes me stronger! Ghost! Only worthy of being used as experimental material! Ghost! It was my first stepping stone to the truth! … Traveling through Demon Slayer, without the talent for swordsmanship and the power of mind to conquer the sky, how could I, who was so small, be willing to be so mediocre? By chance, I seized the opportunity to change my destiny, and thus I embarked on the true path of ghost hunting, ghost hunting, and ghost research. … I have been called "the world's promoter", "the father of architects", "the pioneer of the sword", "the world's reformer" and "the diet reformer" by future generations.