As a result of analyzing the acquired Madan Key at S.H.O.T., it became clear that it was a key to activate RyuGunOu's new powerful technique, the Dragon Cannon. So in order to acquire the powerful technique, Fudou repeatedly undergoes severe training. In the sky of the city, Jamanga's demon beast, Balloon Gunner, appeared. People who took a beam from Balloon Gunner, made them swells like a balloon and floated in the sky. Fudou, who completed the technique with amazing speed, decided to work with Kenji to defeat the enemy and save people...