A great Japanese scientist, Professor Oshikava, built a new reactor called V7, capable of amazing performance in the aeronautical field. Joe, a family friend of the scientist, goes to the professor's laboratory to personally test the new device. There he meets Koji, son of Professor Oshikawa, a boy whose life Joe once saved. At the Akane base, the alarm sounds for the sighting of a Gailar monster which, however, suddenly disappears into thin air. Joe, on board his plane, makes a reconnaissance in the area where the sighting occurred and Koji intends to follow his friend but only gets a sharp refusal. For this prohibition, the boy becomes stubborn and to prove his worth, he tries to go to the place anticipating the hero. In the forest, the little boy is kidnapped and hypnotized by a Gailar commander so the next day Koji, surprising everyone, steals the plans of the V7 reactor conceived by his father.