Mahoromatic Vol 7

Mahoromatic Vol 7 by Bow Ditama. A Comedy manga rated Older Teen, published in English by Tokyopop in 2006.

Mahoro was once a powerful combat android, but with only about a year left in her operating life, she chooses to spend it as a live-in maid for Suguru, a teenage boy living alone. She's devoted, a little jealous, and very determined to keep him out of trouble.