At the base there is concern for Masato, a young man orphaned due to the attacks of the aliens and who now shows aggressive attitudes. Unfortunately, Japan is attacked by a new monster of Gailar and Joe goes out on reconnaissance with his hunting arero. The enemy is too powerful and the young man is forced to make an emergency landing that knocks him unconscious. The hero manages to recover and, with a skillful gunshot, manages to damage the monster enough to put it to flight. Once the enemy who could discover the location of the base has been removed, Rita can intervene with Groizer X and rescue her comrade. The enemy returns to the assault but this time Joe is in command of Groizer X thanks to which he can stand up to him. A long air battle and good triumphs once again over evil. At the end of the adventure Joe and Rita return to little Masato, who will always miss his loved ones but has now found two true friends.