O, Swallow! Fly Cheerfully!. Cargo ships carrying ferrous material mysteriously disappear into the ocean. Benkei, is found near an island because she accompanied Genki who was dealing with an injured swallow that had lost its way. The pilot discovers a factory of the demon empire on the ocean floor and soon a monster comes out to attack the Earth ship. Ryo and Hayato reach their partner to form the Getta Robot but in the meantime the demons have captured Genki and a friend, who remained on the island. Fortunatamante Getta Robot manages to eliminate the enemy monster while the two kids escape the clutches of the enemy.