* An original story not based on any previous material in the franchise.
This film, unlike 1st and 2nd, have a brand new original story using elements from other media, such as the manga Nanoha Force (for Bardiche and Raising Heart new design) and the PsP game Gears of Destiny, as the Florian sisters are introduced here. It's the first part of a two-part story.
A pair of researchers stay behind on their dying planet of Eltria with their two daughters, Amitie and Kirie, in hopes of finding a way to revive the planet. But when the husband Granz falls ill it seems their dream of reviving the planet will die. Against her older sister's wishes, Kirie sets off with her childhood friend Iris to seek help from a distant alternate world. They arrive in Japan on Earth to search for the key to their planet's regeneration. There, they meet Nanoha Takamachi, Fate T. Harlaown, and Hayate Yagami.
