Aru Ni~Tsu, uchū kaijū saranga ga sora kara ochite kita. Shōnen erīto-tai ga chōsa ni iku to, kaijū no kahanshin ga jimen ni merikonde ita. Tsuini urutoramankosumosu ga hippari dasu tame ni detekita. Ayano no bunseki no kekka, saranga wa ninshin shite iru koto ga hanmei. Chikyū ni kita mokuteki wa shussan no tame. Shussan ga chikadzuku ni tsure, saranga no taion wa jōshō. Buji ni shussan dekiru yō umi e michibiku tame, urutoramankosumosu wa shōnen erīto-tai to kyōtō shita.
One day, the space monster Saranga fell from the sky. When the Youth Elite Team went to investigate, they found that the monster's lower body was stuck in the ground. Finally, Ultraman Cosmos came out to pull it out. After Ayano's analysis, it was learned that Saranga was pregnant. Its purpose of coming to the earth was to give birth. The closer Saranga was to giving birth, the higher her temperature rose. In order to lead it to the sea for safe delivery, Ultraman Cosmos fought side by side with the Youth Elite Team.
