Tenka Musou Once More: An Old Swordsman from Another World is Reborn and Becomes the Strongest Boy

Mihne Siegfried, the peerless samurai, after 80 years of dedicated study of the sword, spent his last years alone in the mountains, but it seemed as if his life had ended in seclusion... until his second life began and he once again set his sights on the peak of swordsmanship!