Roxy Ran is an ordinary thirteen-year-old girl who, with her only friend Cinnamon, must deal with the spit bombs launched at them every day by Hero and his gang of bullies. But when Cinnamon rescues a kitten on the way to school, Roxy stops Hero from drowning it by confronting him and his friends with a bewildering display of skills she never knew she had. Roxy has no idea she is turning into a ninja. When new boy Jackson Axe introduces Roxy to the world of martial arts, she learns about the legend of the White Warrior and that their powers are trapped in the Tiger Scrolls. The White Warrior is hunted by ninja and samurai clans for their ability to control the elements of martial arts: wind, water, earth, fire and invisibility. Jackson and Roxy embark on a quest to find the Tiger Scrolls and unleash the powers of the White Warrior before Hero and the samurais do. In order to survive, Roxy must unleash her inner ninja.