Comet Lucifer

Giftium, a highly sought-after crystalline substance, is hidden deep within the planet of Gift. Sougo Amagi, a young boy on Gift, got his fascination with Giftium from his mother, a researcher. Sougo has many possibilities to hunt and gather exclusive crystals because he lives in Garden Indigo, a thriving tiny mining town. However, Sougo finds a human, not a crystal, which is the most fascinating find. He falls into a deep cavern in an old mine after getting caught up in a school fight. Felia, a mysterious young woman with red eyes and blue hair, emerges from a giant crystal there, in the abyssal depths of the earth. Felia and Sougo become friends as a result of their peculiar first encounter. Sougo and his companions must assist Felia while she is being sought after by a covert organization that wants to harness her abilities for their own gain, all the while learning more about the girl in the crystal's actual character.