A thirteen episode anime animated by Seven Arcs and directed by Akiyuki Shinbo that aired between October and December of 2004, and the first installment of the Lyrical Nanoha franchise.
The series is a spin-off of the Triangle Heart series of games and OVAs.
A sequel, Mahou Shoujo Lyrical Nanoha A's, aired between October and December of 2005. A third series, titled Mahou Shoujo Lyrical Nanoha StrikerS began airing on April 1, 2007. Two manga sequels, Mahou Shoujo Lyrical Nanoha ViVid and Mahou Senki Lyrical Nanoha Force, had their first chapters published in May 2009.
This tag implicates lyrical_nanoha (learn more).
The following tags implicate this tag: mahou_shoujo_lyrical_nanoha_a's and mahou_shoujo_lyrical_nanoha_the_movie_1st (learn more).