The Odo (Ohdo) twins, Yuhi and Yuamu, are elementary school students in charge of a company called Uchujin Toraburu Sodansha (UTS) that solves Earthling problems with aliens. During one of their jobs, they meet an alien called Yudiasu (Yudias), who came to Earth to learn about rush duels for his own reasons. Yuhi believes that he was the one who stole his Asudama (Earthdamar) and challenges him to a duel.
