In the apocalyptic city "Odyssey" soaked in steam and soot, life is like a candle in the wind. Ryan, a young scavenger, whose only belief is to protect his sister Lilia. When a nano-plague called "Rust Disease" tainted his sister's breath with the iron smell of death, he was thrown into a desperate situation where he was the enemy of the entire world.
In order to regain his sister's future, Ryan must step into the "Rust Wasteland" swallowed by poisonous sand and dust to find the legendary old world sacred object that can reverse everything - the "Heart of Eden".
What he will face is the fanatical sect that believes in "rust" as a divine revelation and wants to turn Lilia into a "holy body"; it is the Gear Parliament that has laid a dragnet to cover up the historical truth and maintain iron-fisted rule. On this desperate journey, he becomes an ally with Ella, an idealistic scholar who pursues the truth, and struggles to survive amidst mutated mechanical behemoths and endless betrayals.
Every mechanized transformation for strength is a cruel torture of "human nature". When the truth of the world is revealed in the "Library of Silence", and when all forces gather in the eye of the storm of destruction, Ryan must make the final choice - to perish together with his sister as a mortal, or to sacrifice flesh and soul and become... The Heart of Steel to save the era?
This is an epic about igniting hope in despair and protecting the warmth of humanity in the coldness of machinery.
