Jubei-chan: The Ninja Girl (十兵衛ちゃん, Jūbei-chan) is a Japanese anime television series created by Akitaro Daichi (Fruits Basket, Tsukikage Ran).

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.

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 second series introduces Freesia Yagyu, daughter of Yagui Jubei and self-proclaimed heir to the Lovely Eyepatch.

The main conflict in The Secret of the Lovely Eyepatch (ラブリー眼帯の秘密〜, Raburii Gantai no Himitsu) is between the Yagyu Jubei and Ryujoji schools.

The rivalry was seemingly ended 300 years before the events of the series, when Yagyu Jubei defeated the Ryujoji school champion.

The introductory episodes follow the "Monster of the Week" formula: in this case, her teachers and peers constantly challenge her.

In the heat of the battle, Kita Ressai broke through the ice, drowning Jubei Yagyu's wife and daughter along with him.