"One day, the rotation of this planet stopped. The world was shrouded in darkness, and monsters roamed freely in the endless night. To return the planet to normal, it was necessary to wind the Planet Key. The young Machina Mage, Estra, sets off along with her Guardian to challenge the Four Towers, and the Deities within. The Five chosen Machina Mages, the Three Shadows of Darkness, and the mysterious Dragon Skull Warrior... Can Estra overcome the many trials she faces, and bring light back to this world? Estra's adventure now begins."