Amateur girls aim for high prizes and challenge themselves to a human mat twister game where men in full-body tights with color marks are lying down! If they can complete the game within 30 turns, they succeed and win the prize! However, if they stick their butt out or make embarrassing wide-leg poses with their panties showing! Then the mat changes!? An excited human mat pops out an erect penis!? Further more, there are continuous failures in perverted interferences such as lifting skirts or groping chests! If they fail, they are immediately punished with a game of fuck with the men on the mat!