Childish goings-on for Fukuo Fuchida (also known as Fuku-chan) a small boy who attends nursery school with his "girlfriend" Kumi and hangs out with his playmates Namiko (whose parents own a china shop), her younger brother, Kiyo, naughty twins Doshako and Garako and school bully Ganchan. (Source: Anime Encyclopedia)

https://myanimelist.net/anime/23973/Fuku-chan