In the making of the series Gatoh did not find difficulties in creating a balance between sci-fi and realistic elements since multiple Japanese series like "Tetsujin 28" and "Mazinger Z" already provide the demographic a mixture between those elements. Originally, Douji felt that the characters were too realistic. Believing the teenage demographic would not like them, the author changed them so that were seen as cooler characters. While the duo did not have difficulties with the novels' serious storylines, they still had problems with comedy