 __Vita in Mahou Shoujo Lyrical Nanoha A's__  Vita enters A's on a hunt with Zafila for strong Linker Cores to absorb into the Book of Darkness. She targets Nanoha Takamachi, which she deems to be a juicy target, unlike the usual TSAB "redshirts" which can barely fill up a single page of the Book of Darkness.  Nanoha puts up a decent fight, but Vita tilts the deck with two cartridges (bullet shaped things that contain high-pressure magic) manages to overpower her, obtaining a power superiority so vast that she heavily damaged the Raising Heart. However, before she could get the Linker Core, Fate Testarossa and Yūno Scrya come to the rescue. Vita fights them off with her fellow Wolkenritter, Signum and Shamal, and they declare themselves enemies. The battle ends with Shamal finally managing to get Nanoha's Linker Core and Nanoha breaking Vita's barrier.   ~! Vita fights for the sake of protecting their mistress, Hayate, whom she is completely dedicated to and possibly (in the manga, certainly) in love with. The Wolkenritter attack mages to steal their Linker Cores, their sources of magic, to fill the 666 pages of the Book of Darkness with this power before it saps any more of Hayate's and she becomes fully paralyzed. They continue to obtain Linker Cores and fight off interference from the Time-Space Administration Bureau (TSAB), mainly Fate and Nanoha- whose name Vita purposely gets wrong to annoy her- while they try to keep Hayate from knowing that they are stealing magic for pages; she has told them that as long as she is mistress of the Book, she will not allow anyone to be harmed over it.  The Wolkenritter, especially Vita, are determined to save Hayate even if it means going against her wishes. What the Wolkenritter don't know about Hayate is that the Book of Darkness, once completed, may stop sapping her Linker Core for pages, but that does not mean that it will stop hurting her or undo its damage. In fact, the master of the Book dies upon its completion. Vita is the first to recognize that something may be wrong with what they are doing and that they have forgotten something very important, but her devotion to Hayate keeps her fighting for Linker Cores regardless. Just before the Book of Darkness is completed, Suzuka brings Nanoha, Arisa, and Fate to visit Hayate in the hospital while the Wolkenritter are there. The warring groups recognize each other and their shared wish at once, and meet on the roof of the hospital. Nanoha and Fate try to tell the Wolkenritter about what will happen to Hayate, but their confrontation is cut short by both the interference of two masked men and the completion of the Book of Darkness with the Linker Cores of the Wolkenritter themselves.  The masked men are actually women, Alia and Lotte Liese, who frame Nanoha and Fate for the death of Vita and the others. Hayate screams in horror for all of this to stop and is taken over by the will of the Book of Darkness, becoming the fearsome, possessed woman inside of it just as the real duo escapes their prison. Meanwhile, Vita's spirit is trapped inside the Book of Darkness with the others. When Hayate rejects her own wish of vengeance, she reprograms the entire Book, but a virus still remains inside, the one that caused the evil aspect of the Book in the first place. Hayate awakens the spirit of Vita and her friends inside the book of Darkness, and she decides to join the fight against the automated defence program that Hayate describes as "the 'darkness' in the Book of Darkness." Vita finally recognizes Nanoha as an equal, though she won't admit it, and calls her by her real name.  In an epilogue taking place six years later, Vita has not aged, considering her nature as a computer program, and still lives with the other Wolkenritter and Hayate, posing as a relative.!~   __Vita in Mahou Shoujo Lyrical Nanoha StrikerS__  Four years after the A's epilogue, Second Lieutenant Vita is sub-commander of the Stars Squad in the TSAB, working directly under Nanoha, who, in turn, obeys Hayate. She and the other Wolkenritter were kept close to Hayate and each other-- Shamal and Zafira are support, Signum is with the Lightning Squad-- because they work most effectively as a team.  (Source: Wiki) 

After the events of the Lost Logia case, Nanoha waits patiently for the day she can reunite with her newfound friend, Fate. Although being an exceptionally powerful mage, Nanoha spends her days normally with her friends on Earth. But peace is once again suddenly shattered, as Nanoha is without warning attacked by a powerful mage. A group of violent mages have been attacking anything with magic power for their own goals. Nanoha and Fate, along with their friends Yuuno, Arf, Chrono and the Space/Time Administration Bureau must once more band together to stop these renegade mages from hurting anyone or anything else. Takes place after the first season of Lyrical Nanoha.

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Set 10 years after Mahou Shoujo Lyrical Nanoha A's, Nanoha, Fate, Hayate and the rest of the crew are now working full time in the Time-Space Administration Bureau. Nanoha is a combat instructor, Fate is a special investigator, and Hayate is a commanding officer. They must unite once again to save the dimensions. Introducing new characters as well: Subaru, Teana, Caro and Erio. Stand by. Ready. Set up!

Sequel of Mahou Shoujo Lyrical Nanoha The Movie 1st.

The manga takes place four years after the JS incident in Magical Girl Lyrical Nanoha StrikerS, and stars Vivio Takamichi, a fourth-year elementary student at St. Hilde Academy of Magic. Vivio has learned to conjure her adult form and has received her own Device — named Sacred Heart — from Nanoha, and has promised Nanoha to never use either for mischief. Then a mysterious magical fighter appears and targets Vivio.
 
(Source: Anime News Network)

The film will delve into the history between Iris and Yuri, and the tragedy of Eltoria's "Planet Reclamation Committee."

A pair of researchers remain on their dying planet of Eltria with their two daughters, Amitie and Kirie, in hopes of finding a way to revive the planet, but it was no use. Against her older sister's wishes, Kirie sets off with her childhood friend Iris to seek help from a distant alternate world. They arrive in Japan on Earth to search for the key to their planet's regeneration.
 
(Source: Anime News Network)

The series takes place four years after the events of Mahou Shoujo Lyrical Nanoha StrikerS, during which Nanoha Takamachi rescued and adopted a young girl named Vivio, who is the reincarnation of the Sankt Kaiser, Olivie Segbrecht. After entering her fourth year of elementary school, Vivio is given her own intelligence device, Sacred Heart, and gains the power to transform using her adult Sankt Kaiser mode. She soon comes across a girl named Einhart Stratos who, similar to Vivio, is the descendant of another Sankt Kaiser ruler, Claus G.S. Ingvalt. As Einhart becomes determined to prove her fighting style is the strongest, Vivio befriends her and, together with her friends, enters a martial arts tournament where they fight against various opponents and learn more about their past lives.
 
Included one-shot: 
Volume 2: 5th Anniversary Collaboration Comic: Fate/stay night x Mahou Shoujo Lyrical Nanoha

The story appears to be centered on the investigation of the Book of the Silver Cross, an ancient Belkan magical tome. Tohma Avenir, whilst traveling, discovers a girl named Lily Strosek trapped inside a construct. When rescuing her, she gives Tohma an amulet that gives him access to a new Device power. However, unbeknown to them, there is another with a similar Device causing massive damage and injury, leading to an investigation by the Time Space Administration Bureau.

A picture drama released on the BD Box Set of Mahou Shoujo Lyrical Nanoha A's. Subaru, Teana, Vivio host a radio show promoting their own BD Box Sets. This episode is the continuation of the Iryou Shoujo Medical Shamal picture drama episode that was included on the Mahou Shoujo Lyrical Nanoha: The Movie 2nd A's BD release.

Chapters 1-3 are the events that occurred between the end of A's and the start of StrikerS. 
Chapters 4-12 are side stories about the characters. 
Chapters 13 &amp; 14 are the events that occurred after the end of StrikerS. 
Chapter 15 is a special from Megami September 2009 (also events after the end of StrikerS).

A picture drama released on the BD Box Set of Mahou Shoujo Lyrical Nanoha StrikerS. Subaru, Teana, Vivio host a radio show promoting their own BD Box Sets. They look at a hypothetical Midchilda Academy with all the core cast is present be it as students or as teachers.

A pair of researchers stays behind on their dying planet of Eltria with their two daughters, Amitie and Kirie, in hopes of finding a way to revive the planet. But when the husband Granz falls ill it seems their dream of reviving the planet will die. Against her older sister's wishes, Kirie sets off with her childhood friend Iris to seek help from a distant alternate world. They arrive in Japan on Earth to search for the key to their planet's regeneration. There, they meet Nanoha, Fate, and Hayate.
 
(Source: Anime News Network)