The regulations of keijo, Japan's newest competitive sport, are simple: female-only contestants must stand on circular platforms floating in a pool, referred to as "lands," with the objective of knocking off opponents using only their breasts and buttocks. Despite its absurd concept, the sport draws millions of people throughout the country and has a sizable prize fund. Many prospective athletes enter the competition with the hopes of becoming the next national champion. Nozomi Kaminashi, a vibrant 17-year-old, enters the world of keijo after graduating from high school, expecting to bring a wealth home to her impoverished family. Nozomi, a brilliant gymnast, immediately establishes herself as a fierce contender after stealing the show in her first event. As she travels, she meets new friends and opponents.