It was Sekizawa's decision to refer to the twins as "Shobijin" (small beauties), feeling that "small fairies from Infant Island" was too long to write. Sekizawa coined the name "Infant Island" simply because it "sounded good". In the United States, several promotional materials referred to the Shobijin as "Ailenas", despite Japanese publications and materials not using the term. Honda explained that the name originated from the original story that featured a fairy named "Ailena". The name reached the publicity department for overseas markets. Honda had originally written a scene that showed an area of the island bombed by the atomic bomb but due to budget costs, this scene was not filmed.