Magical Girl Lyrical Nanoha A's Portable: The Battle of Aces is a 3D fighting video game written by Masaki Tsuzuki, developed by studio Witch Craft, and published by Bandai Namco on published::January 21, 2010. The game is set in the Nanoha universe and continues the storyline of Magical Girl Lyrical Nanoha A's, albeit in an alternate continuity where Reinforce is given another chance to live on Earth. The age rating for this game is a Canadian equivalent of E10, due to mild violence and zero gore.