In the city of Castelia, where gears and steam dominated everything, Xu Yu was like rusty iron that was trampled under people's feet. As the last descendant of a declining aristocracy, his engagement was torn up by his fiancée in public at the engagement party on the grounds that he could not awaken the "mechanical imprint" in his body and was a "waste" of the city. Amid everyone's ridicule and contempt, a taboo ancient seal quietly appeared on Xu Yu's palm - the "Spiritual Heart" from a lost civilization. This engraving does not burn kerosene or steam. It uses the user's emotions and will as fuel, and can analyze, reorganize and even create any mechanical structure out of thin air. Standing up from his crushed dignity, Xu Yu stepped into the academy city full of steam, pistons and conspiracy. He must learn to control this power that does not belong to this era. Caught between the trap of the hypocrite mentor and the power of the empire, he must use the gentlest will to forge a sharp blade that can shake the steel sky.
