Ruri Tanigawa, a high school girl who loves all things sparkling, heads to the mountains to search for crystals, thinking, "Maybe I can find some too!" There, she meets Nagi Arato, a graduate student majoring in mineralogy, and they begin collecting minerals together. Sometimes walking mountain paths in search of crystals, sometimes wading into rivers to pick up garnets, and other times peering at unknown minerals through a microscope—Ruri dives into the world of mineral collecting, guided by Nagi. "I can find them too." It's a dream everyone has held at some point.