In a steampunk world where the gears of the industrial revolution turn thanks to a special fossil fuel known as Meteoria Coal, a young miner named Kanata struggles to improve his harsh lot in life. Working in the depths of a mine, he dedicates himself to his studies and hones his skills, striving to escape his oppressive circumstances. His fate begins to change when he discovers a new vein of the precious mineral, setting off a chain of events that thrusts him into an adventure far greater than he could have imagined. But when a giant monster suddenly appears before him, his life is completely upended. From the depths of the mines, Kanata rises to find his path leading him toward enrollment in a prestigious school for monster hunters. As he learns to harness the power of the mysterious meteoric coal and confronts the creatures that threaten his world, the young miner's destiny begins to turn like a great cog.