 __Triangle Heart:__  Miyuki is actually the cousin of Kyouya and Nanoha, but is raised by their family and she considers them siblings. She is very close to Kyouya, and an accomplished Mikami twin kodachi style swordsman like her brother. She and Kyouya are hired to guard their childhood friend Fiasse, who is now a legendary singer and heiress. Fiasse's real bodyguard, Ellis, is particularly set off by this, and the three guards must learn to deal with and respect each other as they protect Fiasse on her concert tour around the world from someone who seeks to kidnap her. Miyuki and Kyouya work particularly well together, and she is shown as very competent on her own, defeating an entire Special Duties Unit team single-handedly in the first OVA. However, Miyuki does not like to fight, seeing it as simply a duty to protect those one cares about.   

__Mahou Shoujo Lyrical Nanoha:__  Miyuki is the real sister of Nanoha and Kyouya here, and lives with her two siblings, her mother Momoko, and her father Shirō. She is a very minor character, but her and Kyouya are still extremely close, and are still excellent swordsmen.  In one episode, Nanoha, wishing to improve her technique with her magical staff Raising Heart, observes Miyuki's solo training. Throughout the first season, Miyuki remains unaware of magic, although she founds out about Nanoha's powers at the end of A's.  

(source: wikipedia) 

3rd grader Takamachi Nanoha stumbled upon an injured talking ferret after hearing his telepathic cries for help. The ferret turned out to be Yuuno, an archeologist and mage from another world who had accidentally scattered the dangerous Jewel Seeds throughout Earth. Without the strength to collect the Jewel Seeds, Yuuno had resumed a ferret form and needed someone else to take on the task for him. He gave a red jewel to Nanoha explaining to her with this she could transform and use magic to combat the monsters that threatened them due to the Jewel Seeds. But the monsters are the least of their worries, as Yuuno and Nanoha are not the only ones out to collect the Jewel Seeds. 

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**Video Game Roles:**
Kappei Hiiragi (Clannad)
Asuka Kazama (Tekken 5-8)
Jay (Tales of Legendia)
Mais (Rune Factory 3)
Jude Maverick (Wild Arms 4)
Arlan (Honkai: Star Rail)

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.

Fiasse is a world-renowned singer. She is now the headmistress of a special Singing School who does a Charity World Tour every year. Her mother left behind a inheritance for her after she died and some shady people are after Fiasse and the inheritance. Bring in Ellis, and two siblings who are master of the swords to protect Fiasse. The World Tour is coming up and Fiasse will continue the show. Ellis, Kyoya, Miyuki and company must protect their childhood friend at all costs.
 
(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

Miyuki Takamachi