In an empire ruled by giant steel beasts and thick steam, machinery is the only belief, and pure steam energy flow is the source of power. In the shadow of this huge city called the "Heart of Gears", any "old-age witchcraft" that attempts to change the nature of matter and touch upon the deep mysteries - especially alchemy - is regarded as the most dangerous blasphemy against the industrial foundation of the empire, and is ruthlessly purged and severely suppressed.