Magical Girl Lyrical Nanoha: The Movie 2nd A's

Several months after the Jewel Seed incident, Nanoha Takamachi prepares to reunite with Fate Testarossa, who has just returned from her trial with the Administrative Bureau. Fate, granted clemency for helping stop the crisis, is now allowed to attend school with Nanoha. But before they can settle into their new routine, a group of mysterious dark mages attacks them. Overwhelmed, Nanoha and Fate have their mana drained by a sinister grimoire, leaving their devices, Raising Heart and Bardiche, damaged. The attackers are the Wolkenritter-Vita, Signum, Shamal, and the familiar Zafila-summoned by the Book of Darkness to fulfill its dark purpose. The book's current owner, a young girl named Hayate Yagami, remains unaware of its true nature, while the Wolkenritter, forced to gather mana for its completion, carry out its will. Stripped of their power and weapons, Nanoha and Fate must quickly recover to stop the Wolkenritter before they complete the Book of Darkness-and risk unleashing its destructive magic on the world.