Naruto the Movie: Ninja Clash from the Land of Snow

Koyuki has long, straight, very black hair, light blue eyes, and a hexagonal crystal necklace that she never takes off. She usually wears elegant actress-like clothes, but carries a sad and distant air. The story begins when Team 7 is given the mission to protect her—the famous actress Yukie Fujikaze—during filming in the Land of Snow. But she runs away, saying she hates that place: in reality, she is the true Princess Koyuki Kazahana, who fled when her uncle Dotou killed her father and stole the throne. Dotou sends ninjas in ice armor to capture her to get the necklace, which he believes to be a treasure. But the necklace is a device created by her father: capable of transforming the perpetually frozen country into a place with spring. In the final confrontation, Naruto faces Dotou and uses a special seven-colored Rasengan, defeating the villain and activating the device. The ice melts, the sun appears, and Koyuki finally smiles, assuming her place as ruler and thanking Team 7 profusely.
But don't worry, everything will happen just like in the real movie.