Sixteen years ago, a mysterious masked ninja unleashed a powerful creature known as the Nine-Tailed Demon Fox on the Hidden Leaf Village Konoha, killing many people. In response, the leader of Konoha's ninja forces, the Fourth Hokage Namikaze Minato, and his wife Uzumaki Kushina, the Demon Fox's living prison, to seal the creature inside their newborn son Uzumaki Naruto. With the Tailed Beast sealed, things continued as normal. However, in the present day, peace ends when a group of ninja called the Akatsuki attack Konoha under the guidance of Tobi, the mysterious masked man behind Nine-Tailed Fox's rampage years ago who intends on executing his plan to rule the world by shrouding it in illusions. Naruto and Sakura are subjected to Tobi's Genjutsu, brought to an alternate world where many they know have opposite personalities while learning that Naruto's parents are alive in this world while Sakura's parents are dead.

Source: Wikipedia

Note: Episode 311 of Naruto Shippuuden serves as a prologue to this movie.

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Parent story: Naruto Shippuuden