Magical Girl Lyrical Nanoha A's

Magical Girl Lyrical Nanoha A's (魔法少女リリカルなのは エース) (A's pronounced as Ace) is a thirteen episode sequel to Magical Girl Lyrical Nanoha, a magical girl alternate universe spinoff of the Triangle Heart series of games and OAVs. A third series, Magical Girl Lyrical Nanoha StrikerS, was released in 2007.

Plot
A nine-year-old wheelchair-using girl named Hayate Yagami forms a contract with the intelligent weapon named the Book of Darkness (whom Hayate later names Reinforce). As a result of this contract, four Belkan knights named Signum, Vita, Zafira, and Shamal appear in front of Hayate in order to fulfill the task of filling the pages of Book of Darkness by capturing magic from various sources. Once the pages of the Book are filled, its master, Hayate, will be able to make a single wish.

Since the end of the last anime series, Magical Girl Lyrical Nanoha, the two nine-year-old girls named Nanoha and Fate have been exchanging video mails to tell each other of their situations on earth and in the Time-Space Administration Bureau respectively. At the beginning of the series set half a year after the first, Nanoha is attacked by Vita who desires her magic in order to fill the Book's pages. As Nanoha is about to be defeated, Fate saves her, and Vita retreats.

As the knights continue to fill pages of the Book of Darkness, Nanoha Takamachi and Fate Testarossa try to stop them and retrieve the Book with the help of the Time-Space Administration Bureau. However despite their efforts and due to the well-intentioned but negative interference of Graham Gil and his familiars, the Book of Darkness is completed, its pages filled. It begins to go beserk in spite of the wishes of Hayate. Through a combined effort, Hayate, Fate, Nanoha, and their helpers manage to defeat the Book and later destroy it completely.

Manga
A manga adaptation of the story was serialized in Megami Magazine, with a few changes to the storyline, mostly elaborating on the characters. For example, Nanoha must also deal with Raising Heart draining her magical power with every move she makes, and explores how Hayate views the Wolkenritter as her children.

Gakken released the manga in a single volume on February 18, 2006.

Anime
Seven Arcs produced a thirteen-episode anime series, directed by Keizō Kusakawa and written by Masaki Tsuzuki. Broadcasted on Chiba TV, TV Saitama, and TV Kanagawa, it premiered on October 1, 2005 and aired weekly until its conclusion on December 24, 2005. The music for the series was produced by Hiroaki Sano. The series features two pieces of theme music. "Eternal Blaze", performed by Nana Mizuki, is the opening theme. "Spiritual Garden", performed by Yukari Tamura, is the ending theme. In Japan, the series was released across six Region 2 DVD compilation volumes between January 25, 2006 and June 21, 2006.

Magical Girl Lyrical Nanoha A's was later licensed by Geneon for English-language dubbed release in the United States and Canada. Funimation Entertainment distributed the dubbed series across a Region 1 DVD boxset.

Audio CDs
A series of three drama CDs have been released by King Records between November 23, 2005 and March 8, 2006 entitled Magical Girl Lyrical Nanoha Sound Stage 01~03. The CDs take place during and after the anime series. Each release charted on the Oricon album charts, and the highest ranking album was the Magical Girl Lyrical Nanoha Sound Stage 03, which peak ranked at 52nd and remained on the chart for 2 weeks.

The original soundtrack was released across six CDs entitled Magical Girl Lyrical Nanoha A's Original Soundtrack Plus Vol.1~6 that were released alongside the DVD volumes that compiled the series' episodes containing 57 tracks in total. A compilation album entitled Magical Girl Lyrical Nanoha A's Vocal Best Collection was released exclusively at Comiket 70 in August 2006, compiling many of the pieces of music used during the drama CDs. King Records released three maxi singles for the series. "Eternal Blaze" was released on October 19, 2005. "Spiritual Garden" was released on October 26, 2005. "Super Generation" was released on January 18, 2006 that contained the track "Brave Phoenix", which was used as an insert to episode twelve of anime series.

Video game
Namco-Bandai Games released a game adaptation, entitled Magical Girl Lyrical Nanoha A's Portable: The Battle of Aces, on January 21, 2010 for PlayStation Portable.