[DeepL Translation - needs review] The "hidden sword" is a secret that is never told to the outside world. When the hidden sword is needed, it means the worst. Kakushi Ken Oni-no-Tsume" (Hidden Blade Oni-no-Tsume), which depicts a man who is at the mercy of a wife who takes desperate action for her husband, who has turned into a sword demon and is now in prison, was the basis for the movie of the same name. The other eight novels in the series include "Shofu Ken Shofu," "Assassin Ken Toranog...
