Two close friends engage in a pie-throwing battle while wearing swimsuits. The loser of each rock-paper-scissors round gets pied by the other. At first, the loser sticks out their butt and gently accepts it with a cheerful "Go ahead~", but as the pie throwing continues, their bodies become soaked, with faces and hair completely covered in gooey mess. As the chaos unfolds, the two grow even closer, sharing laughter and sweat in an increasingly intimate and playful episode.