Chika is the same age as Miu, and attends the same class as her neighbor Miu. Chika is a cheerful girl who shows more common sense than the other girls, especially Miu. Her main role in the series is that of an average, twelve-year-old girl, which is emphasized in the first manga volume, where Nobue describes Chika as specializing 'in being totally generic'. Her special skill is cooking, especially baking cookies. Chika is Nobue's little sister. She is nicknamed Chi-chan or just Chi. Miu is another twelve-year-old girl who is depicted in the story as having a problem-child personality. A childhood friend of Chika, she lives next door to the Ito house and attends the same class as Chika. Miu likes to say random things out of the blue and often plays pranks on Matsuri and Ana, but is most of the time interrupted by Nobue (and sometimes by Chika), ending up lying face-down on the floor. She has the least common sense or manners of the girls, and is rarely taken seriously because of her weird ideas and comments. She seems to harbor some sort of jealousy of Ana and Matsuri, because Nobue finds them cuter. She does not have any delicacy and tends to do things that bother people around her. Miu is nicknamed "Mi-chan". Miu has been described as "Yotsuba Koiwai with fangs". While she is often causing trouble for the other girls, an interview with the cast that was published in volume 4 of the manga series reveals that Miu is extremely fond of Chika, whom she dubs as her 'one and only'. The interview also goes on to claim that Miu derives satisfaction from amusing Chika, and that she will never go to bed before making sure that Chika's room light is turned off. There are also scenes within the manga which hint at signs of lesbianism from Miu towards Chika; when Miu reveals that the both of them have kissed and rubbed each other's breasts, Chika makes no attempt to deny the claims or defend herself. Matsuri, nicknamed "Mats" in the manga, is an eleven-year-old glasses-wearing girl with a pet ferret named John, and is depicted as having a very timid personality in the story. She is often the subject of Miu's teasing and can resort to crying and hiding behind Nobue. She is one grade below Chika and Miu, in the same class