Deimon has a school festival, where a large contest is being held. Everyone decides not to participate, since Hiruma will probably win, but now, it turns out Hiruma isn't playing! The team divides into groups of three (Sena, Suzuna, and Omosadake; Monta, Mamori, and Kurita; Kuroki, and two cheerleaders; Ishimaru, Yukimitsu, and Komusubi; Togano, Musashi, and Taki; Jumonji and the team mascots). Each tries to outdo the others, but at the same time, for the very first time, Sena's enjoying the festival, where he's not treated like a gofer anymore.
