Unleashing a devastating surprise attack, flying ninjas from the Land of Sky are seeking revenge against their old enemy Konohagakure. Despite his eagerness to join the fight, Naruto Uzumaki is held up by Shinnou, a mysterious doctor who requires his assistance to save an injured person. While delivering the wounded man to the hospital, Naruto has an unexpected encounter with Amaru—a stormy youngster from a neighboring village desperately looking for Shinnous help.