Mahoromatic

Mahoro wants to have a bigger bust, since she was designed as a combat android, her parts were built for maximum efficiency. So, she buys strange machines to try different things. However, they prove to be unsuccessful. The next day, she gets a mysterious package from Vesper, containing a counter-attack device. They are hidden missles in a bra to counter attack a super machine sent by the Caretakers. She uses them, and saves the day.