The series is set in an alternate reality where a new, women-only, gambling sport known as “keijo”, quickly becomes a fad in Japan. It matches are held atop floating platforms, known as “Land” in the swimming pool stadium. The players fight to defeat their opponents or send them out to the water, by using their breasts or buttocks. Olympic athlete Nozomi Kaminashi becomes a player, wishing to win the high earnings. While participating, she defeats her opponents while learning that the way to fame and fortune in a new uncommon sport has more challenges than she ever imagined.