Title: Hyakunen Kesshou Mokuroku | A Hundred-Year Crystal Catalogue | 百年結晶目録
Author/Artist: Aoi Aki
Summary: Bent, who gathers minerals as a sample for his research, goes to the Akkrum mines which has been closed for a long time. Then, he saw a young person inside it who suddenly collapsed. The boy’s name was Iris. Using minerals as his food, the color of the boy’s pupil glistens with rainbow colors…
Note: Last chapter!