1 My First Mineral Hunt
High school girl Ruri meets graduate student Nagi while collecting minerals in the mountains.
★ 8.5 2 The Value of Golden Color
Ruri is determined to find gold, but Nagi explains that it might not be as likely as she hopes.
★ 8.0 3 The Lost Planet
Ruri meets Nagi's colleague Imari, and the three embark on a journey to find a lost mine.
★ 8.0 4 Study of Sands
In search of sapphire, Nagi teaches Ruri how to study sand, but Ruri prefers to hunt on a bigger scale.
★ 7.0 5 Worlds Seen and Unseen
Ruri, Nagi, and Imari head to the beach in search of agate, and Ruri learns about the long lifecycle of rocks.
★ 7.0 6 A Closer Look into the Blue
Just as the group begins searching for sapphire on foot, Ruri uncovers a grave mistake that halts their plans.
★ 8.0 7 Seaside Recycling Studio
Ruri finds sea glass on the beach and runs into her classmate Shoko, who has a secret passion for minerals.
★ 8.0 8 The Golden Elegy
Ruri teams up with Shoko for a science project, which takes a turn when they discover a strange, orange rock.
★ 8.0 9 Time Capsule of 1.9 Million Tons
Ruri and Nagi head out to hunt for opals but discover that the area has already been fully excavated.
★ 7.0 10 Sentence to an Abandoned Railroad
Imari leads a hunt for manganese ore, when the group encounters a mystery along abandoned railroad tracks.
★ 8.0 11 The Sapphire Cradle
When Ruri has trouble deciding on her future, she turns to her study of sapphire.
★ 8.0 12 Memories Come with Rocks and Noise
When Ruri discovers her grandpa's old crystal radio, she's determined to restore it.
★ 7.0 13 Look Up, Examine, Search! And Next!
Ruri, Shoko, Nagi, and Imari take a trip together, where they search for meteorite at a hot springs inn.