Naruto, Sasuke, and Sakura have passed the final test to become junior ninja-but now the real challenge begins. Tired of finding stray cats and doing day care, the young ninja ask for a tougher assignment, and find themselves-together with their teacher, Kakashi-bodyguarding a cranky bridgebuilder from the faraway Land of the Waves. But Tazuna the bridgebuilder is in more danger than anyone realizes: he's the target of elite ninja assassins, including Zabuza, 'the demon,' the most murderous of the Mist Ninjas. And to even have a chance of defeating Zabuza, Kakashi will have to use the secret power concealed in his always-hidden left eye.