In 2317 AD, after the "Great Mechanical War", the earth's land was covered by 70% of the "Steel Desert". The only remaining "Green Dome Reserve" was inhabited by mutated beasts containing "beast cores" in their bodies - this was the only energy source that could fight against the mechanical army.
The "Organization Society" that rules the world monopolizes the technology of extracting beast cores, forcibly dismantles alien beasts, implants them into mechanical skeletons, creates unconscious "mecha beast soldiers", and massacres those who resist. During an escape, the orphan Lu Chen was accidentally selected by the dying "Earth-Shattering War Bear". The "Resonance Gene" awakened in his body can be directly linked to the beast's core - without disassembly or modification, the alien beast can autonomously fuse mechanical parts to form a "Mecha Beast God" with independent consciousness.
In order to protect the alien beasts and companions in the Green Dome Reserve, Lu Chen teamed up with Xia He, a girl who mastered mechanical repair technology, and Chen Mo, a defector who was a researcher of the Mechanical Society, to embark on a journey with the Earth-Shattering War Bear. They have to cross the "Beast Core Mine" under the steel desert, sneak into the "Mechanical Fortress" of the Mechanical Society, and in the battles with the mechanical beast soldiers, awaken more controlled alien beasts, and uncover the secret of the Mechanical Society's attempt to use the "ultimate beast core" to transform the earth into a purely mechanical planet. When the Earth-shattering War Bear evolved into the "Earth Titan" and Xia He's "Wind-Wing Falcon" unfolded its metal wings, the ultimate showdown between "life and machinery" was beginning at the end of the steel desert.
