Rita, an 21-year-old who is Mrs. Hilda's third daughter, is a smart and mysterious girl who loves to personally teach her friends—Pilika, Marlene, and Shimiko, who live in the neighboring houses and are the same age as her—how to discover things they didn't know before. For example, she teaches them how to discover the beauty of the housemaids and nannies inside their bedrooms while they are sleeping, as a way of returning the kindness and love shown to them every day. However, they must make these discoveries without waking them, and under no circumstances are they to tell anyone; they must keep it a secret.