Six months have passed since the events of the previous movie. Fate Testarossa has returned to Uminari City with Lindy Harlaown as her legal guardian and is living the life of a normal elementary schoolgirl along with Takamachi Nanoha and her friends. The reunion between the two new-found friends is cut short however, when they are assaulted by four ancient magic users who identify themselves as the Wolkenritter. As the motives behind the actions of the Wolkenritter become clear, Nanoha and Fate find themselves in a race against time to stop the reactivation of a highly dangerous artifact known as The Book of Darkness.

Source: ANN

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Alternative version: Mahou Shoujo Lyrical Nanoha A's
Prequel: Magical Girl Lyrical Nanoha The Movie 1st
Sequel: Magical Girl Lyrical Nanoha Reflection