@The first volume of Sekai Otogibanashi [Fairy Tales of the World] series (100 vols.). The binding is almost the same as Nihon Mukashibanashi [Old Tales of Japan] series and Nihon Otogibanashi [Fairy Tales of Japan] series. Iwaya expanded the retelling from strictly Japanese tales to world tales. Sekai Otogibanashi series introduces interesting and easy to read stories for children, including myths, old tales, and legends from all over the world as well as stories by Andersen and others. It took about ten years for Iwaya to complete the series.
@The number of the volume, the variety of the stories, and the scale of the series are unparalleled and unique, especially as a work completed by a single author. During the publication of the series, Iwaya went to Germany and collected materials for the story, which is why many rare stories are included.
@ "Sekai no Hajime" retells well-known three episodes from the Old Testament: the Creation, Adam and Eve driven from the Garden of Eden, and Noah's Ark. Stories in "Ningen no Hajime" ["The Origin of Men"] were taken from Greek myth and legends of ancient times written by a German. The stories are about Prometheus who created men and about his son Deucalion who threw a stone on Mt. Parnassos and created new men.
@Later Iwaya published Kaitei Shûchin Sekai Otogibanasi [Revised Pocket Edition of World Fairy Tales] (10 vols.). As the series gained public favor together with Nihon Mukashibanashi series and Nihon Otogibanashi series, similar volumes by different authors were published by other publishers. Iwaya published a sequel to the series titled Sekai Otogi Bunko [Pocket Edition of World Fairy Tales] (50 vols.).