Mahoro is an android known as Vesper who has only one year left to live. In order to make the most out of her remaining time, she decides to take on a job as a maid for Suguru Misato. Despite being an artificial intelligence, Mahoro enjoys cooking, cleaning and even taking baths with Suguru. Additionally, she possesses a strong moral code which causes her to confiscate any ecchi magazines that she discovers in Suguru's room.