is a spin-off

Spin-off (media)

In media, a spin-off is a radio program, television program, video game, or any narrative work, derived from one or more already existing works, that focuses, in particular, in more detail on one aspect of that original work...

 manga

Manga

Manga is the Japanese word for "comics" and consists of comics and print cartoons . In the West, the term "manga" has been appropriated to refer specifically to comics created in Japan, or by Japanese authors, in the Japanese language and conforming to the style developed in Japan in the late 19th...

 series based on the Magical Girl Lyrical Nanoha

Magical Girl Lyrical Nanoha (series)

is a Japanese multimedia franchise that encompasses three anime television series, a theatrical adaptation of the first series, multiple manga and Drama CD adaptations and sequels, as well as model figures and plastic models...

 series. It takes place after Magical Girl Lyrical Nanoha StrikerS

Magical Girl Lyrical Nanoha Strikers

is the third season of the Magical Girl Lyrical Nanoha series. The Nanoha anime was, in turn, a spin-off of the Triangle Heart series of games and OVAs, specifically Triangle Heart 3: Sweet Songs Forever...

and follows one of its characters, Vivio Takamachi.

Magical Girl Lyrical Nanoha ViVid is serialized in the Japanese magazine Comp Ace

Comp Ace

is a Japanese computer game and manga magazine published by Kadokawa Shoten. Comp Ace began as a special edition version of another one of Kadokawa Shoten's magazines, Comptiq. The first issue was released on March 26, 2005, and was published quarterly for the first three volumes which had cover...

 since its July 2009 issue which was released on May 26, 2009. As of September 2011, Kadokawa Shoten

Kadokawa Shoten

is a well-known Japanese publishing company based in Tokyo, Japan. Kadokawa has published both manga novels and magazines, such as Newtype magazine...

 has compiled its chapters into four bound volumes.

Story

Set four years after StrikerS

Magical Girl Lyrical Nanoha Strikers

is the third season of the Magical Girl Lyrical Nanoha series. The Nanoha anime was, in turn, a spin-off of the Triangle Heart series of games and OVAs, specifically Triangle Heart 3: Sweet Songs Forever...

, the Sixth Mobile Division has disbanded and Nanoha Takamachi

Nanoha Takamachi

is the main and title character of the Magical Girl Lyrical Nanoha series and also appears in Triangle Heart. Minami Hokuto plays her in Triangle Heart, and Yukari Tamura in Magical Girl Lyrical Nanoha. She has a strong aptitude in magic, a rarity for those born on Earth, amongst these numbered few...

 has taken a leave of absence to raise her adoptive daughter, Vivio Takamachi. After reaching the fourth grade of her primary school, she is finally given her own device, which gives her the form of the Sankt Kaiser mode. She later meets a girl named Einhart Stratos who, like Vivio, is a descendent of a ruler of the Sankt Kaiser era, and wishes to prove her fighting style the strongest. Together, Vivio, Einhart and their friends enter a martial arts tournament to prove their fighting style the strongest.

Characters

The protagonist of this story, Vivio is a girl who was rescued and adopted by Nanoha during the events of StrikerS. Her intelligent device, Sacred Heart, is shaped like a crystal and appears to be a rabbit, which is nicknamed . She is able to transform into an adult form at will, which she claims is more convenient for battle skills. It is similar to the Sankt Kaiser form she fought Nanoha in beforehand, except that her barrier jacket is white instead of black.

A user of Kaiser Arts that had given herself the name of the previous Sankt Kaiser, . She picked street fights in order to prove that Hegemon's strength is the greatest of all Belkan warriors. Like Vivio, she has heterochromia

Heterochromia

In anatomy, heterochromia refers to a difference in coloration, usually of the iris but also of hair or skin. Heterochromia is a result of the relative excess or lack of melanin...

 and possesses both a child form and an adult form, though the latter is taxing on her mind. Her true identity is discovered by Nove and the Nakajimas, who decide to help her better understand everyone and become acquainted with Vivio, the two girls eventually becoming friends. She later receives an intelligent device named Asteon which is similar to Vivio's in that it is a support device made to look like a baby leopard.

Nanoha has taken a leave of absence from her duties following the disbanding of the Sixth Division in order to look after her adoptive daughter.

Nanoha's "best friend", who also acts as a mother figure to Vivio. She is still currently working for the Time-Space Administration Bureau.

One of the former Numbers

Numbers (Nanoha)

is a group of characters in Magical Girl Lyrical Nanoha StrikerS. Jail Scaglietti's personal task force, they are all "combat cyborgs" , humans that acquired special abilities by implanting mechanical elements into their bodies. As their group name suggests, their specific names are all based on...

, who was adopted by the Nakajima family following StrikerS. She acts as a coach in Strike Arts and is good friends with Vivio. Following a battle with Einhart, she decides to help her understand the world a bit better.