Demon Blade: The Assassin Katana of Onimaro

Once praised as "Yotsuya Masamune," the renowned swordsmith Kiyomaro was living in seclusion in the mountains with his apprentice Onimaro. However, Kiyomaro, who had begun to suffer from trembling hands due to alcohol and could no longer forge satisfactory swords, one day confided in Onimaro.