In Super Duper Sumos, three 18-year-old Sumos travel to the modern world with ancient powers to defend the innocent and battle the evil Ms. Mister and her cohorts. You can choose to play as Booma, Defender of Peace; Kimo, Defender of Honor; and Mamoo, Defender of Truth. The Sumos are supersized heroes in a normal-sized world and use their special powers--"Gluteus Maximus," "Honorable Thunderball," and the "Sumo Squeeze"--to double in size and destructiveness in order to fight evil.