Keijo!!!!!!!!, the incredible imaginary sport that combines busty girls in swimsuits with gambling. The idea of the game: knock your opponent off the island with either your boobs or your butt, which is actually a lot harder than it sounds. Nozomi Kaminashi is a budding Keijo!!!!!!!! player who's just entered the Setouchi Keijo!!!!!!!! Training School hoping to become a professional. But on the road to glory, she will face many hardships, and only those with the firmest of butts and complete chest control can rise to the top. Will Nozomi and her friends make it through training and onto the professional circuit, or will they sink into watery depths of average-dom?

The world of middle school girl's ping pong received a big shock when reigning champions Oudou Academy were recently destroyed at this year's nationals, giving other schools hope for the next competition. One such school is Suzumegahara Middle School which has a few pretty good players of its own, including one Agari Kamiya who currently holds the top spot in the ping pong club. Things receive a bit of an upset though when new transfer student Tsumujikaze Koyori shows up at school, who despite being a shy air-head, has a passion for ping pong that cannot be matched, and who swiftly claims the number one spot for herself. Club dynamics aside though it's looking like Suzumegahara may stand a chance at nationals this time around.