The story is set in the late 1950s and early 1960s, during the height of Japan's economic boom, when the circus is a major form of entertainment. Different circus troupes travel throughout Japan to perform and compete for a chance to participate in the world-renowned festival called "Circus Collection." One troupe called the "Sunflower Circus," led by its ringmaster Maria, travels around Japan to perform, despite struggling with financial difficulties. However, they meet a circus prodigy named Mizuka Tsurumaki. This is the story of a one-of-a-kind circus show of young girls with big dreams.