Four years have passed since the resolution of the "JS" incident of Urban Terrorism. The "6th Mobile Unit" has been dissolved. Its ace of aces, First Class Captain Takamachi Nanoha has finally found time to rest her wings. A new generation is being raised. This is the tale of the only daughter of the former ace of sky, Takamachi Nanoha. A vivid tale of Takamachi Vivio.