Kazama Yui, a country girl from Kyushu, was recruited by the Dark Director and given the role of the third Saki Asamiya. Yui is sent to Tokyo to meet up with her long-lost sisters, Yuka and Yuma, and they inherit the family's ninja art in order to solve the menace of a psychic terrorist known as the Emperor. Now turned into a trio of kunoichi, they would battle the villain and his army.