On the edge of the Victorian kingdom where gears roar and chimneys stand, "entropic rust" spreads quietly - the filthy blood of the Cthulhu Familia can cause the most sophisticated mechanical prosthetics to rust and runaway in an instant. As a new member of the "Gear Knights", Leon Kedra is equipped with the dangerous "Ether Forge" power armor and hunts monsters under the shadow of urban ghost stories and the threat of mechanical erosion. He teamed up with Cecilia Weller, the genius mechanical priest of the Gear Monastery, to abandon brute force and rely instead on "harmonic resonance gears" to analyze the monster's crazy sonic frequencies. As the hunt deepened, they discovered an evil conspiracy to sacrifice human souls to summon ancient gods in the name of a "perpetual motion mechanism." Leon's talent for "motor neuroscience" grew rapidly in the game between machinery and flesh and blood, and a mechanical game concerning the survival of industrial civilization began, eventually pushing the church to establish the "Taboo Technology Review Committee" to guard taboo technologies.
