Kenji Kazama arrives at school looking to leave an impression, but ends up forced into joining the Game Creation Club. Later, the Student Council Vice-President and fourth member of the Kazama Party, Ataru, reveals some backstory about the Student Council President Chitose.

When Kenji skips school one day, he finds himself confronted by members of the "real" Game Creation Club, claiming the one he joined was a fake club. When he confronts his own club members about it, he discovers that the leaders of both Game Creation Clubs were actually friends in one club, but Roka didn't like how the other members talked about her, so with Chitose's help she started her own club.

As the day of the school festival draws near, the presidents of both Game Creation Clubs prepare to make their own games to show the students at the festival. Takao and Roka agree that the loser's club will be absorbed by the winner, while Chitose threatens to do "that" (an undefined action) to Takao if her club wins. Later that day, Kenji discovers that Takao's club did a decent job of making their own video game, while Takao finds that the "fake" club made a mini-carnival with various analog games, as the rules never specified the type of game they had to make.

Some of the teachers decide to bet over whether the Game Creation Club or the former student council will win their battle. Chitose has a flashback to when she was a kindergartner playing in a sandbox. Every time she tried to build a sandcastle, Tama would come over and smash it, until Roka appeared and helped Chitose bury Tama in sand. Since that day, Chitose swore to one day build a legendary sand castle, and Tama swore to break everything that Chitose loved for her humiliation. In the present, Tama's sumo slap attacks and "double kabuki" technique are keeping both Kenji and Chitose from getting to her cell phone. However, Kenji comes up with a plan that lets him slip past her guard and pull off Tama's hair ribbons, letting Roka subsequently place a bag over her head. The Game Creation Club is declared the winner. Later, Tama plays a round of "Quest for Porn Mags in Space" to get closer to Kenji, while swearing to his club members that her original goals haven't changed.