The series takes place four years after the events of Mahou Shoujo Lyrical Nanoha StrikerS, during which, magical girl 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 magical opponents and learn more about their past lives.
(Source: Wikipedia)+ More
Characters & Voice Actors

Vivio
Main
Agito
Supporting
Alpine, Megane
Supporting
Alpine, Lutecia
Supporting
Arpinion, Chantez
Supporting
Chevelle, Micaiah
Supporting
Cinque
Supporting
Crozelg, Fabia
Supporting
Dahlgrün, Victoria
SupportingRecommended for you
Carp Reborn
ONA
18m
New Fist of the North Star
OVA
58m
Dream Eater Merry
TV
24m
Asura Cryin
TV
24m
Fractale
TV
23m
Macross 7 Encore
OVA
24m
Bosco Adventure
TV
25m
Digimon Adventure (2020)
TV
23m
Digimon Data Squad
TV
23m
Gate Keepers
TV
25m
Future Boy Conan Movie
Movie
122m
Napping Princess
Movie
106m
Gatchaman
TV
26m