Jiyu Nanohana leads an average school life until she meets a 300-year-old samurai who is a bit absent-minded. He informs her that she is the rebirth of Yagyu Jubei. Wearing the "Lovely Eyepatch," she can activate her extraordinary swordsmanship to combat foes. The rival clan seeks to conquer Yagyu in revenge for an ancestral squabble, so Jiyu must frequently use her deadly skills.