sentences:  Soon after graduating, he wrote numerous dōjinshi and was an assistant to numerous manga artists, prior to making his debut as a professional manga artist.In 1986, Tsuruta made his professional debut, authoring his first manga series, the short work, , which was serialized in Kodansha's "Weekly Morning" seinen magazine, set in a world where the land was sinking into water.Tsuruta has cited that the inspiration to this debut work of his came during a train journey from Tokyo to the ocean at Odawara, during which he had seen numerous rice paddies and thought of the possibility of a train line passing through the ocean, after which he wanted to create a work where he could use this image.