First year of the Kanei Era (1624). What if Jubei Yagyu, the swordsmanship instructor of the Tokugawa family, had been a female? Jubei has kept this fact to herself, but one day the shogun Tokugawa Iemitsu sees her naked and asks for her body: she refuses, leading to her pursuit. That's how begins an escape that makes full use of the secret art of the Rashinken, "True Naked Sword".

From the back of Volume 1