Shitsugo no Ken

A historical period known as the "Hundred Empty Years" is marked by a complete absence of records. During this time, legends speak of a power surpassing modern civilization. In present-day Tokyo, Hachikazu Soudou, a sorcery expert skilled in one-on-thousand combat, experiences helplessness when unable to save a dying childhood friend. A government agent named Shizuku Yabusaki approaches him with an unexpected offer: to travel back to the Dark Ages.