Magical Girl Lyrical NANOHA A's

It’s about six months since the last incident. Although she now practices her magic, Nanoha has returned to her ordinary life as she waits for a reunion with Fate. But suddenly, assailants appear before Nanoha. Who is this young girl with the Book of Darkness who collects the magical energy of mages?

Fate comes to the rescue and manages to ward off Vita, but sustains hits from Signum and Zafira, also guardian knights of the Book of Darkness. The difference in fighting power has everyone in a pinch. Bardiche is badly damaged, and Nanoha is…

Nanoha’s magical energy has been stolen. In order to solve the mystery of the Book of Darkness, the crew of Arthra is dispatched to a temporary post in Uminari City and form a task force. Fate begins school as Nanoha’s classmate. As for the damaged Raising Heart and Bardiche…

The knights spend their days with gentle and kind Hayate. In order to unravel the truth behind the incident, Nanoha and the others decide that they must face the knights once more. Raising Heart and Bardiche are returned to their owners, but what are their new powers?

Raising Heart and Bardiche are reborn with the cartridge system equipped. Using this new power, Nanoha and the others are fighting against the knights, when a new fighter, a mysterious masked man appears...

How Hayate met the guardian knights and their daily lives up until this point. The guardian knights fight solely for Hayate's sake. Meanwhile, Yuuno is sent to the TSAB headquarters, where he begins investigating, aided by Chrono's teachers, the Rieze sisters.

Yuuno's investigation reveals the truth of the Book of Darkness. Nanoha's group heads to the guardian knights who are continuing gather pages. However, the masked man appears once again in the middle of the fight and Fate is...

Hayate's health takes a sudden turn for the worse and the guardian knights hurry to complete the Book of Darkness. Nanoha and Fate accompany Suzuka to the hospital to meet Hayate, but...

Chistmas Eve. Moments before the completion of the Book of Darkness, Nanoha and Fate discover that Hayate is the master of the Book of Darkness. After a fierce and troubled fight, the Book of Darkness' seal is finally broken. However, what awakes is...

In order to realize Hayate's wish, the will of the Book of Darknes defeats Nanoha and her comrades and attempts to destroy the world. The identity of the masked knights is revealed and and the incident catapults towards its climax.

Fate is trapped inside the Book of Darkness. Its will tries to lull her into a "peaceful sleep." Hayate responds to the will of the Book of Darkness. Nanoha feels impelled to engage the full drive mode of Raising Heart.

Hayate becomes the true Master of the Night Sky grimoire "Re-enforce."However, the disengaged defense program begins to go out of control and the knights and the Bureau work together to deal with it. Nanoha decides on a certain course of action to handle the situation.

The Book of Darkness incident is over. As life returns to normal, Nanoha makes a decision. Small goodbyes and new departures. This is the climax episode of the series, following the future of each of our characters.