On a night when the twelve emerald moons are arranged in an upside-down crown, Iris, an orphan from the Crystal Spirit tribe, and Leona, a hybrid dragon girl, undergo a blood mutation at the same time. A royal star pattern appeared in Iris's left eye, and crystal wings symbolizing royal power grew from behind; Leona's mechanical prosthetic arm burst out with dragon flames, and the battle memories of the ancient dragon clan were awakened in her body. The two shared pain and illusions through "Crystal Vein Resonance", but witnessed each other's fate of fighting each other in fragments of different time and space.
The Bronze Colossus Legion of the Mechanicum took advantage of the unusual celestial phenomena to launch a massive attack. The barrier of the Holy Land of the Crystal Spirit Tribe collapsed, and curse runes appeared on the dragon eggs in the Dragon Tribe's incubation pool. When Iris inherited the "Book of Endings" that recorded the doomsday prophecies, and Leona unlocked the war memories in her blood, the sky opened a giant eye that was a mixture of machinery and flesh. The ancient tree spirit sang a doomsday elegy, predicting that the "Twin Thrones" would break the reincarnation of the three races - either work together to end the crisis of crystal vein depletion, or usher in the crystallization of the world through mutual killing.
In this epic adventure that interweaves magic awakening and steampunk technology, two teenagers must unlock the chains of memory deep in their bloodline, and find the truth about the "Tears of the Sky" and the "Heart of Flame Core" under the shadow of the Mechanicum's pursuit and racial isolation. And every night when the emerald blood moon shines, the twin moles on the back of their necks glow dangerously...
