A duel is held in the underground kingdom, the robot beast brothers Reds and Blacks were chosen as Jeeg's assassins. On the other hand, on the ground, Mayumi's puppy had disappeared. Mayumi gets acute pneumonia because she searched around in the rain. Hiroshi entrust a pendant to Mayumi, who suffers from nightmares due to high fever, and Hiroshi challenges the robot beast brothers to a fight!