
Overview:
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)
Characters and Voice Actors

Vivio Takamachi
MAINKaori Mizuhashi
Japanese

Einhart Stratos
MAINMamiko Noto
Japanese

Fate Testarossa
MAINNana Mizuki
Japanese

Nanoha Takamachi
MAINYukari Tamura
Japanese

Chantez Apinion
SUPPORTINGKana Asumi
Japanese

Erio Mondial
SUPPORTINGMarina Inoue
Japanese

Caro Ru Lushe
SUPPORTINGMikako Takahashi
Japanese

Hayate Yagami
SUPPORTINGKana Ueda
Japanese

Subaru Nakajima
SUPPORTINGChiwa Saitou
Japanese

Lutecia Alpine
SUPPORTINGNatsuko Kuwatani
Japanese

Zafila
SUPPORTINGKazuya Ichijou
Japanese

Nove
SUPPORTINGChiwa Saitou
Japanese

Wendi
SUPPORTINGMarina Inoue
Japanese

Agito
SUPPORTINGMami Kameoka
Japanese

Vita
SUPPORTINGAsami Sanada
Japanese

Reinforce II
SUPPORTINGYukana
Japanese

Shamal
SUPPORTINGRyouka Yuzuki
Japanese

Signum
SUPPORTINGKaori Shimizu
Japanese

Corona Timir
SUPPORTINGMisato Fukuen
Japanese

Rio Wezley
SUPPORTINGEri Kitamura
Japanese

Dieci
SUPPORTINGNozomi Masu
Japanese

Deed
SUPPORTINGShizuka Itou
Japanese

Garyuu
SUPPORTING
Ixpellia
SUPPORTING
Solfège
SUPPORTINGJamie Schyy
Japanese
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