Akiho und Kaito sind die beiden einzigen Mitglieder des Roboter-Forschungsklubs der Chuo-Tanegashima-Oberschule. Akiho hat vor, einen riesigen Roboter zu bauen, mit dem sie dann auf die EXPO geht.

Kaito and Akiho go with their teacher, Mitsuhiko Nagafukada, to where the Robo-One tournament is being held, though they have no hotel to check into. As Kaito practises with the robot, he experiences a strange sensation for a brief moment. The tournament soon begins and Kaito manages to use his tactics to get through the preliminaries and into the finals. Before the final match, Akiho starts to grow concerned about Kaito, who hadn't gotten a lot of sleep prior to the tournament. The final match soon begins against the reigning champion, Mr. Pleiades, whose robot has some fierce tricks up its sleeve. While Kaito's robot is at a disadvantage against Subaru's, Kaito suddenly experiences an inverse of the ailment Akiho has, slowing down time for him, and makes a counterattack, knocking both of them out, though this technically results in Kaito's loss. Upon returning home, Kaito has a brief encounter with Kill Ballad's creator, Frau Koujirou.