Deep within the planet of Gift lies the coveted substance Giftium, and Sougo Amagi, a resident of Garden Indigo, has been captivated by it thanks to his mother's research. Despite having many opportunities to search for the crystals, Sougo's most valuable discovery is Felia, a mysterious girl who emerges from a large crystal. During an attempt to break up a school fight, Sougo stumbles into an abandoned mine where he encounters Felia with her red eyes, blue hair, and enigmatic presence. She quickly becomes a close friend, but her powers are sought after by a secret organization. Sougo and his team must not only help Felia escape her pursuers, but also discover the truth about her identity.