Nanoha Takamachi - Nanoha in A's

Nanoha in A's

In A's, while Nanoha still has been living quietly in her home, she has become much more confident and capable with her magical abilities. This is partially indicated with a training scene in the anime's first episode, in which she practices her magical precision and control by hitting a can of cola repeatedly in the air. Also during the first episode, she is attacked by one of the Wolkenritter, Vita, and is defeated due to the difference in power of their weapons; her weapon is also severely damaged as a result. While Fate Testarossa, Yuno Scrya, and the rest of the Time-Space Administration Bureau manage to rescue Nanoha, in the course of the battle that ensues, Nanoha's Linker Core is drained, preventing her from using magic for the first few episodes of the series. Both this draining and the limitations of Raising Heart are corrected by the fourth episode of the series, in which Nanoha's Linker Core fully recovers and Raising Heart is upgraded (with the addition of the Velkan cartridge system) to become Raising Heart Exelion.

As the series progresses, Vita becomes Nanoha's primary rival; Vita is the only member of the Wolkenritter who Nanoha fights directly. The course of this rivalry is reflected in Vita's attempts to pronounce Nanoha's name; at first Vita is unable to do so, but correctly pronounces it in the penultimate episode of the series once the two have become friends. The series also highlights the growing friendship between Fate and Nanoha that began in the first season, as Fate ends up going to Nanoha's elementary school and becoming friends with Suzuka and Alisa. While Nanoha has no direct connection to Hayate Yagami (the master of the Book of Darkness) at first, it is Nanoha and Fate that first discover Hayate's identity as a result of her friendship with Suzuka.

During the battle with the Book of Darkness, Nanoha's identity as a magical girl is revealed to Suzuka and Alisa, and it is implied that by the end of the season, Nanoha has told her friends and family about her magical abilities and her work with the Time-Space Administration Bureau. In addition, Nanoha becomes friends with Hayate and the Wolkenritter as a result of their shared battle against the Book of Darkness.