Keijo, a novel gambling sport, has swept through Japan. Competitors stand on floating circular platforms and must defeat their rivals using only their breasts and buttocks. Hoping to secure a fortune and escape poverty, 17-year-old Nozomi Kaminashi is drawn into this female-only sport. She decides to leave her gymnastics career behind to apply for the Setouchi Keijo Training School, joining Sayaka Miyata, her new friend and a former judo athlete. In the upcoming exam, the girls must exert their utmost abilities to qualify as students. Focused solely on the final goal, Nozomi and Sayaka prepare to compete against participants from across the country.