When an average schoolgirl named Jiyu Nanohana encounters a quirky 300-year-old samurai, her life takes a drastic turn as she learns she is the reincarnation of Yagyu Jubei. Equipped with the 'Lovely Eyepatch,' she can channel the legendary swordsman's formidable combat skills whenever the need arises. This power becomes essential as she faces off against a rival clan determined to conquer Yagyu and settle a deep-seated family vendetta.