Eltria, a planet on the brink of extinction, is home only to Kyrie Florian, her elder sister Amitie, and their parents who work as scientists trying to rescue it. The family must abandon the world to get treatment for their father, who has fallen ill with a fatal disease.
Even after medicine, Kyrie"s dad"s chances of survival are slim. Determined not to abandon her father or Eltria, Kyrie defies her sister"s orders and flees to the tranquil planet Earth in search of help. On Earth, she teams up with childhood friend Iris and seeks out the planet"s magical guardians—Nanoha Takamachi, Fate Testarossa, and Hayate Yagami.
These guardians hold the key to Kyrie"s goal, and she will stop at nothing to secure it. Yet the protectors are reluctant to cooperate, making her task hard. Soon, Amitie arrives on Earth to halt Kyrie"s rash actions and drag her back home, adding more tension to an already fragile situation. The journey forces Kyrie to confront her deepest fears and question the limits of love.
