The bowels of the planet Gift hide a highly sought after crystalline mineral known as Giftium. Sougo Amagi, a young child on Gift, received his interest in Giftium from his mother, a researcher. Sougo has several possibilities to forage and acquire rare crystals that can only be found in Garden Indigo, a tiny and rich miner's community. The most thrilling prize that Sougo discovers, however, is not a crystal, but a person. He falls into the deep chambers of an ancient mine after getting drawn into a school brawl. Felia, an intriguing girl with red eyes and blue hair, rises from a giant crystal in the earth's terrible depths. Bonds are formed as a result of this unexpected first meeting.