In the first season, Yuuno advances his "Intelligent Device" to Nanoha, changing her into a Magical Girl and permitting her to balance and assemble the Jewel Seeds, which have unexpected and devastating effects when they come in contact with humans.
The series uses two pieces of theme music; the opening theme is "Innocent Starter" performed by Nana Mizuki, and the ending theme is "Little Wish (Lyrical Step)" performed by Yukari Tamura.