Mahoromatic: Automatic Maiden
Vesper is fighting an army of alien invaders by using powerful androids. Mahoro is Vesper's most powerful android but she does not have much operating time left and will stop working. If she conserves power, she will prolong her life by a year. She is given the chance to live a normal life and she chooses to become a maid for a high school student who lives all by himself.