A family consisting of a husband, wife, and their two daughters, Amitie and Kirie, decide to remain on the decaying planet of Eltria in hopes of finding a solution to bring their home back to life. Unfortunately, Granz, the husband, becomes sick and their optimism diminishes. However, Kirie, determined to save her family's planet, teams up with her childhood friend Iris and travels to a distant world in search of assistance, despite her sister's objections. They eventually land in Japan, where they come across Nanoha, Fate, and Hayate, who may possess the answer to rejuvenate Eltria.
