mahou shoujo lyrical nanoha a's portable: the battle of aces
A video game spinoff of Mahou Shoujo Lyrical Nanoha A's for the Playstation Portable, which takes place in an alternate continuity in which the ending of A's is changed.
Has an upcoming sequel, Gears of Destiny.
This tag implicates mahou_shoujo_lyrical_nanoha_a's (learn more).