The Boy Whom Shouts at the Sea!. A couple of fishermen, father and son, see a plane explode on a nearby island. The two intervene and the dying pilot gives the boy a ribbon to be delivered to Prof. Saotomè, a sort of black box that reports the conversations of the soldier with the rest of the flock. A monster suddenly emerges from the ocean and devastates the boat causing the two men to fall into the water. The boy is found by the Throwing Theme and the tape is recovered which, duly analyzed by the professor, reveals the possible existence of the demon base. Ryo, Hayato and Musashi go out in perlusatration with a perschereccio in the offending area and are soon attacked by the monster that drags the boat to the bottom and only thanks to a stratagem the boys manage to save themselves and reach the island by underwater swimming. The three, from a careful analysis, discover the underwater monster and a hydrogen bomb that the enemy intends to use to trigger a world conflict. Benkei places a bomb in the enemy base while Mikiru takes the three snow Getta to the island; when the enemies notice the presence of the team of heroes they put the monster into action that soon engages in a fight with Getta Robot. When victory is about to smile at the enemy the bomb explodes and the Getta gains an advantage. The captain of the deomons, however, draws a secret weapon and takes command of a bomb dinghy that he intends to detonate against the enemy but when everything seems lost, the young fisherman appears on the island who kills the demon to avenge his father and saves the situation.