In the realm of Gift, a young boy named Sougo Amagi inherits a fascination for the precious crystal Giftium from his researcher mother. Residing in the flourishing mining town of Garden Indigo, Sougo explores the depths for rare crystals unique to the area. Among his discoveries, the most remarkable find isn't a crystal but a mysterious girl named Felia. Their meeting unfolds in the depths of an ancient mine after a school dispute leads Sougo into its depths. Felia, with crimson eyes and azure locks, emerges from a colossal crystal, sparking an unlikely friendship with Sougo. However, Felia is hunted by a clandestine group seeking to exploit her powers, propelling Sougo and his allies into a quest to protect her and unravel the enigma surrounding this crystalline maiden.