Jubei-chan: The Ninja Girl (十兵衛ちゃん Jūbei-chan?) is a Japanese anime action comedy television series created by Akitaro Daichi (Fruits Basket, Tsukikage Ran). Jubei-chan follows Jiyu Nanohana, a modern highschool girl and unwilling heir to the Yagyu Jubei school of swordsmanship. The series is recognized for its magical girl stylings, including a mystical artifact, the Lovely Eyepatch, that serves as the source of the heroine's power.
Jubei-chan comprises two television series. The Secret of the Lovely Eyepatch premiered April 5, 1999 and revolves around Jiyu Nanohana coping with her newly entrusted powers and responsibilities and the centuries-old feud between the Yagyu and Ryujoji schools. The Counter Attack of Siberia Yagyu premiered January 7, 2004. The second series introduces Freesia Yagyu, daughter of Yagui Jubei and self-proclaimed heir to the Lovely Eyepatch. The Counter Attack of Siberian Yagyu focuses on Jiyu and Freesia's developing friendship and subsequent rivalry.
The series was broadcast worldwide through Animax. The Secret of the Lovely Eyepatch was licensed in North America by Bandai Entertainment. The rights to The Counter Attack of Siberian Yagyu were held by Geneon Entertainment. Both series were licensed by Media Blasters in 2012.
Jiyu Nanohana is an ordinary schoolgirl until she runs across a scatterbrained 300 year old samurai who tells her that she is the reincarnation of Yagyu Jubei. With the help of the "Lovely Eyepatch" she transforms into the legendary swordsman whenever she needs to use his awesome fighting ability, which she needs to do quite often as a rival clan is dead set on conquering Yagyu to satisfy an old family grudge.