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The series is set in an alternate reality where a new, women-only, gambling sport known as "keijo", quickly becomes a fad in Japan since its introduction in the dawn of the 21st century. Keijo matches are held atop floating platforms in large water-filled stadiums where bikini-clad players fight to incapacitate their opponents or push them out to the water, but they can only hit each other using their breasts or buttocks.