Mahoromatic

Mahoromatic is a manga series written by Bunjūrō Nakayama that was serialized in Comic Gun from 1998 to 2004, with an anime series produced from September 2001 to January 2003 and two OVAs released in August 2003 and October 2009. Its main character is Mahoro Andou, an android who acts as maid to the son of her commander out of regret for her actions as a soldier during an alien invasion.