Demon Slayer: the Immortal Swordsman

In this world, the war between the human organization Demon Slayer Corps and ghosts has lasted for thousands of years. Ubuyashiki Yoshiya is known as the wisest leader in the history of the Demon Slayer Corps. However, he has led the Demon Slayer Corps for more than ten years, but he has never been able to pose a real threat to the ancestor of ghosts - Muzan Demon Slayer! Until one day he opened the biography of the head of the Ubuyashiki clan passed down from generation to generation and saw this yellowed record: "When the immortal swordsman named 'Zuo Chuan' pulls out the Sun Blade he buried underground, the whole world will tremble, and the howls of the evil spirits will reach the deepest hell..." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.