Joshua, a young duke hailed as a prodigy, led his dukedom from the brink of collapse to prosperity in just 15 years through his mysterious knowledge. At 23, he was respected and admired, and the dukedom's prosperity seemed assured. However, a coup orchestrated by a saintess led to his exile to the frontier. Despite this, Joshua is secretly delighted. He wants a peaceful retirement, having experienced overwork in his past life in Japan, the source of his extraordinary knowledge. The frontier is desolate, but people start gathering around him, forcing him to ensure their food, clothing, and shelter. Using his innate plant appraisal ability, modern knowledge, and experience in governance, he vows to develop the frontier and achieve his dream of leisurely retirement.