Kiko is a four-year-old (five in the end of the series) girl who attends a private kindergarten in Tokyo. She is capable of doing many things most four-year-olds are not capable of; these include cooking, unassisted grocery shopping, limited acrobatics. Despite the title of the series, it is very rare to actually see Kiko smile and almost as rare for her to speak. Despite this, Kiko is quite popular with her classmates. She also has a wide variety of interests, including ballet, learning English, playing video games and interfering with her teacher's love life.
