Mahoromatic: Automatic Maiden

In a world threatened by alien invasions, Mahoro Andou, a powerful combat android created by the secret organization Vesper, is nearing the end of her operational time. With only a month left before she shuts down, Mahoro is forced to choose between continuing to fight and preserving her life for over a year by avoiding combat. Her decision leads her to become the maid of Suguru Misato, a high school boy living alone in his late parents' large house. As Mahoro settles into her new life, she develops strong bonds with Suguru and his friends, but her true intentions and past remain shrouded in mystery.