While most people find the world mundane, five-year-old Yotsuba Koiwai sees it as a treasure trove of amazing bustle and wonderful places to explore. When she and her adoptive father, Yousuke, move to a new city, the energetic young girl naturally sets out to investigate the neighborhood on her own. After a few incidents at the local park, the Koiwais become acquainted with their neighbors, the Ayase family. Their three daughters—mischievous college student Asagi, responsible high school studen