Mineral collecting is the modern treasure hunt! Ruri, a high school girl who loves gemstones and accessories, dives into the world of mineral collecting, exploring mountains, rivers, and caves. In the first volume, a variety of minerals such as quartz, garnet, pyrite, placer gold, and fluorite appear. The collection scenes using specialized tools like panning dishes, hammers, and topographic maps are also full of charm. A genuine science adventure based on the author's solid knowledge of mineralogy!