Five Amateur girls in swimsuits take on the challenge of a water balloon popping game! They pop water balloons with their butts within the 60-second time limit! The prize money goes up by 1,000 yen for each balloon they pop! If they change into lewd swimsuits, they get a bonus chance to increase the prize money! Amateur girls change into lewd swimsuits in the hopes of winning a big prize! But their breasts slip out! Even their private parts are exposed! If they change into even more extreme swimsuits, they're almost completely exposed! They're bound to blush! Amateur girls who fail the challenge are punished with an instant fuck!