Long ago, a hidden kingdom called Spheres existed on Earth, unknown to recorded history, and its people possessed what would now be called psychic powers. As the divide between its social classes grew and power-hungry factions rose, the kingdom fell. Na Yeon is a mysterious girl discovered in the Antarctic after its destruction. Asten, the chairman of the Sphere Union, dreams of ruling the world and sends his followers to watch her. Together with her friends, Na Yeon works to stop the Sphere Union from seizing three artifacts that serve as the keys to world conquest, in an action fantasy series.