Young Duke Joshua, known as a prodigy, transformed his duchy from the brink of collapse into a prosperous nation in just 15 years with his mysterious knowledge. At 23, he was respected and adored by all, and the future of the Rodel Duchy seemed secure. However, a coup led by a holy maiden exiled him to the frontier. Despite this, Joshua is elated to start a peaceful, retired life. He had a past life in Japan, which is the source of his enigmatic knowledge. In the frontier, where his manor stands alone, people who admire him begin to gather, forcing him to ensure their basic needs. Using his innate 'Plant Appraisal' ability, modern knowledge, and administrative experience, Joshua vows to develop the frontier quickly so he can enjoy a life of leisure.