In Japanese with English subtitles

The Planet Erutoria is dying of deterioration. The Florian family (husband, wife and their daughters, Amitie, and Kyrie) still remains on the planet in the hopes of saving it. However the father, Grants Florian, is stricken with a serious illness and the family's dream to revive their dying planet is collapsing. Kyrie, the younger sister, wishes to help her father in reviving the planet and goes on a journey with her best friend, Iris, to a far away universe against Amitie's advice. Their destination is the small island of Japan which is located in the far east of planet Earth. They go to see three girls (Nanoha Takamachi, Fate T. Harlaown, and Hayate Yagami) who live in there to search for the key that will fulfull their dream of saving their home planet. This encounter will lead to two worlds meeting and determine the fate of the two planets.