Ruri Rocks

High school student Ruri Tanigawa spots a beautiful crystal necklace while shopping, but it's too expensive for her to buy. Her mother mentions a mountain area where Ruri's grandfather once found many minerals, sparking her curiosity. Hoping to gather materials to craft her own jewelry, Ruri heads there and meets Nagi Arato, a graduate student who kindly guides her. When they reach a massive quartz formation, Ruri is completely awestruck. Filled with excitement, she persuades Nagi to teach her about mineralogy. As she learns more and uncovers new treasures, Ruri realizes that minerals hold far greater value than just their cost-Nagi's lessons deepen her appreciation for them in ways she never expected.