In this study, it was considered that the space ‘island’ of ‘Heterotopia’ is what kind of place it is and that Japan, It was centered. “Ukigumo” and “Yakushima Kiko” by Hayashi Fumiko, released after the Pacific War.The island ‘Yakushima’ that emerged from the above works is represented by the primitive space of nature, isolated from the scars of war and the world of civilization, at the same time, an island of boundaries that did not have a route to war anymore.Yukiko and Tomioka spent a warm time in the peaceful Dalat of the island, a kind of land opposite to the war outside..However, after being defeated in the defeated Japan, it had to endure hard and cold days. Dalat is a happy space with Tomioka to Yukiko, and it is expressed to Tomioka as a place where he could demonstrate his professional value and presence in the nature.The reality that they faced after returning to Japan after the war was so harsh and cold.In the end, the island of the southernmost part of the island, Yakushima, where two people went as if they were, is regarded as an impression similar to ‘Dalat’ appearing in a sweet dream. Maybe it is because the remote island of Yakushima, like Dalat, was thought to be another paradise where two people can live with each other or each can dream. However, the reality of Yakushima strongly rejects the image of the ideal of the new world as frequent rain and isolated terrain. In other words, there was no actual ‘Paradise’ where we got away from reality. The island as a ‘Heterotopia’ that the male and female protagonists sought is emerging as a boundary and a feeling of loss as if they represented the current defeat of Japan. In short, Yakushima is a cross-section of postwar Japan, Japan is dreaming of a paradise on earth, and now is the present dream of a dream.