Magical Girl Lyrical NANOHA EXCEEDS Gun Blaze Vengeance

Thirty years ago, aliens attacked Earth and nearly wiped out humanity. Since then, mankind has fought to survive, battling the invaders for land, and the UN set up EXCEEDS, an agency to hold off alien threats. On a remote island in a world of chaos, young hunter Shiina longs for a quiet life with her sister, Setsuna, but one incident pulls her into the larger battle.