Mahou Shoujo Lyrical Nanoha: The Movie 1st (2010)

Synopsis

Takamachi Nanoha is a normal third-grader who feels a little useless and out-of-place with no purpose. Then one day, she saves a ferret, who turns out to be a mage from another planet who came to this planet to search for the jewel seeds. Nanoha agrees to help, but this task gets complicated when another girl arrives to steal them.Source: ANN