``Adults love to see children's smiles.'' Daiya's teacher, Naito, calls the delivery shop. The request is to deliver fireworks to his grandson, Senji, who is camping. However, a beast appears in the mountains where Senji is playing. Ponto, who happened to be camping, rushes in, but is caught in the crossfire and sustains damage. Daiya joins them, but after a fierce battle, the beast becomes gigantic. Furthermore, due to Cannonborg's strategy, Nejiretta and his friends also acquire gigantic forms. In a pinch where many enemies are a threat, a new Bunbunker created by Bundrio and Yasushirou arrives. At first glance, the car looked like a fire engine, and it also had the appearance of a red lion... A lion roars on a burning mountain.
